To assess the current state of the economy and future trends, investors use various tools: GDP dynamics, stock indexes, unemployment, inflation, PMI business activity index, producer inflation, consumer expectations indicator, etc. But in addition to stock indexes, you can also analyze the value of the national currency of the United States - the dollar.Since the stock market is an integral part of the economy, as integral as the dollar in the economy, the dynamics of the value of the national currency can serve as signals potentially important for the investor. The dollar is the main currency of international settlements, the main world reserve currency, the main volume of debt obligations in the world is issued in US dollars. Therefore, the value of the dollar is a kind of barometer not only of the US economy, but also of the world economy. The dollar has its own index - the DXY dollar index (DXY or USDX tickers).In this article, we will look at what the US dollar index DXY is, how it is calculated and how to interpret the dynamics of its value.What does the US dollar index DXY meanThe US dollar Index (DXY) is a calculated indicator of the market value of the US dollar relative to the "basket" of monetary units of the countries - the most important trading partners of the United States. The index basket consists of 6 currencies: euro, Japanese yen, British pound sterling, Canadian dollar, Swedish krona and Swiss franc.We can say that indirectly, the index value characterizes the dynamics of US exports, because with its growth, the demand for the dollar also increases.To calculate the index, currencies are assigned different weights in accordance with the shares of currencies in US international trade:At the time of the index's creation, to a greater extent, it was they who held the primacy in the foreign trade turnover of the United States. More than half of the weight (57.6%) has the euro, and the share of the smallest component – the Swiss franc - is 3.6%. Based on the weight of each currency pair, it can be concluded that the role of the euro in the formation of the dollar index is several times higher than that of other currencies.The DXY index is calculated using the weighted average geometric calculation method. Each national currency of the US partners from the currency basket of the index has its share of influence on the USDX index. The formula has the following form:The index value reflects the change in the ratio of the dollar to other currencies compared to its base value. The coefficient 50.14348112, which is involved in the calculation formula as the first term, was selected in such a way that the initial value of the index was 100 p. The power coefficients are equal to the shares of the corresponding currencies in the index base.The growth of the index indicates an increase in the value of the dollar compared to the "basket" of currencies, i.e. its strengthening, and vice versa, its decline indicates that it has become weaker. If the index value is greater than 100, then the strength of the dollar has increased by the corresponding amount. And, conversely, when the dollar price decreases, the index decreases.History of the US dollar index DXYThe calculation of the dollar index began in 1973 after the termination of the Breton Woods Agreement. In accordance with this agreement, for a long time, the currencies of 44 countries were pegged to the dollar, which, in turn, was backed by gold ($35 per troy ounce (gold standard).In 1973, the United States refused to link to gold, because its reserves in the United States were limited to a certain amount, and the dollars secured by gold were not enough for the development of world trade. Since then, countries have switched to floating exchange rates of national currencies.In the same 1973, the DXY index was created as a barometer evaluating the "paper" dollar in relation to other currencies. Initially, the basic basket of the index included 10 currencies, of which 8 were European. The base of the index has changed only once – in 1999 in connection with the formation of the eurozone and the emergence of the euro. The euro replaced 5 currencies of European countries from the index. Until 1999, the most significant currency for calculating the USDX index was the national currency of Germany – the German mark.The initial value of the index was taken as 100 p. The following index calculation results are measured as a ratio to the base value.Initially, the US dollar index was developed by the US Federal Reserve System in 1973 to obtain the average value of the US dollar weighted by foreign bilateral trade, freely floating against world currencies. Now the index is calculated by the ICE exchange holding (Intercontinental Exchange, Inc.). The calculation is made daily, once an hour. There are no regular adjustments or rebalancing of the ICE US dollar index.The values and dynamics of the dollar index may be different, but the following values are taken as benchmarks.More than 100 pp. – similar values indicate the strength of the dollar relative to other national currencies from the index basket.Equal to 100 p.p. – this means that the dollar is at the level of the other currencies of the index basket.Less than 100 pp. – this indicates the weakness of the US national currency.As can be seen on the graph, the maximum index value (160 pp.) was fixed in 1985, the minimum (72 pp.) - during the 2008 crisis. At the time of publication of the article (10.08.2022), the index value is 106.303 pp. This means that the value of the dollar has increased by 6,303 p.p. compared to the baseline value. This is the highest value in the last 20 years.Thus, the DXY index measures how the dollar price changes on the world market.What does the dynamics of the dollar index DXY indicateThe specificity of the DXY dollar index is that its dynamics cannot be interpreted unambiguously. Unlike conventional currencies, which fall when the country's economy deteriorates, the US dollar can strengthen both during economic growth in the US and during a global recession or economic downturn. This feature is due to the fact that the dollar is the world's reserve currency and plays a unique global role in the global economy. On the one hand, investors see the American currency as an opportunity to make money on the economic recovery, on the other hand, they consider the dollar as a relatively safe asset that will allow them to survive difficulties while saving their savings. This feature is called the "dollar smile theory". There are 3 phases in the behavior of the dollar:Phase 1 – Dollar growth due to increased risk aversion. The dollar is strengthening with a decrease in the growth rate of the global economy and an increase in risks in the markets. In such a situation, in order to avoid possible losses or minimize them, investors exit risky assets and direct funds to the dollar, which is considered a "safe haven currency". At this stage, the investor's goal is to preserve, not increase, the available capital. In addition, to invest in US Treasury bonds that are considered risk-free in any economic situation, dollars are also needed, which leads to increased demand for them and an increase in the exchange rate.Phase 2 - Economic recession and recession. At this stage, the economy is showing signs of slowing down or even recession, and the Fed is starting to cut interest rates. Investors are starting not to buy, but to sell the dollar in order to switch to currencies that can provide higher returns. Demand for the dollar is weak, which leads to its fall.Another factor is the relative economic efficiency of the United States and other countries. The US economy may not necessarily be stagnant, but if its economic growth is weaker than in other countries, then investors will prefer to sell US dollars and buy the currency of a country with a stronger economy. As a result, the lower part of the "smile" is formed - the dollar is falling.Phase 3 – Economic growth. The values of fundamental indicators are beginning to indicate an improvement in the economic situation, i.e. the phase of economic growth. Companies are increasing production, there are signs of economic recovery. Investors' risk appetite is returning. Thus, with stronger GDP growth in the US economy compared to other countries, the dollar is also strengthening. Thus, the key factor in the dynamics of the dollar index is relative economic growth. If the economy of the "rest of the world" can grow faster than the US economy, this will lead to a weakening of the US dollar. If the US economy is growing faster, then the US dollar will grow. In fact, the influx of foreign money into American enterprises and investments leads to an increase in the value of the dollar.An example of such a scenario is the 2008 crisis. In mid-2008, investors sought stability during the crisis period in the form of investing in the dollar, which led to its strengthening. As the situation normalized and the crisis processes slowed down, the focus of investors' interests began to shift to more profitable and risky instruments. This flow of capital led to a significant drop in the US dollar in early 2009. The recovery of the US economy from the crisis caused an increase in demand for the dollar and, as a result, its strengthening until the end of the 1st half of 2010.The factor of updating the highs of the dollar value relative to world currencies from the reserve basket in 2022: the Fed started tightening monetary policy earlier than other major central banks (against which the yield of government treasury bonds began to rise), the problems of the eurozone, the devaluation trend in the euro and yen, the weakness of stock markets. All this together makes American investments more profitable, because now they promise higher profits. Finally, investors and analysts are concerned about the global recession – the dollar is traditionally considered the most reliable asset in turbulent times.Let's take a closer look at how the change in the dollar index affects the dynamics of some investment instruments and the economy of enterprises.BondsThe increase in the profitability of investments in US Treasury bonds is accompanied by an increase in the DXY index. Bonds are traditionally considered the lowest-risk assets that allow you to save capital. At the same time, in order for them to be attractive for investment, their profitability should be higher than the inflation rate.Currently, due to an increase in the interest rate and an increase in bond yields, investors are starting to exit riskier assets of other countries, i.e. there is a flow of funds into the dollar for further investments in bonds. In addition, due to the unstable global economic and geopolitical situation, the demand for the most risk-free instruments is growing. This leads to a strengthening of the dollar.StocksA stronger dollar is not always good for equity investors. It means:A decrease in the profits of exporting companies and global corporations from sales of products in other countries.An increase in the costs of exporters, which leads to an increase in prices for the goods they produce and, as a result, a decrease in competitive advantage.Increasing the costs of foreign companies operating in the United States.Thus, the growth of the DXY index signals a weakening of the US stock market, i.e. the dollar index is basically moving opposite to the S&P 500 index.Such a decline in the market is due to the fact that a strong dollar makes imports cheaper and exports more expensive and less competitive in world markets. The rising dollar affects the profits of many global corporations.Exporting companies and global corporationsCompanies that supply their products around the world make more profit with a weak dollar.The high values of the DXY index, i.e. the growth in the value of the dollar negatively affects US exports. In this case, the volume of goods purchased by other countries decreases, because they need more of their own currency to buy the same volume. That is, US companies face the following consequences of the strengthening of the dollar:Decrease in the volume of exports.Margin reduction, as a result of a decrease in the volume of funds received, including for the development of the company. In this case, there is a significant adverse effect of exchange rate fluctuations.The weakening of the exchange rate of a foreign currency against the US dollar adversely affects the company's sales and revenues denominated in a foreign currency (other than the dollar), and usually leads to the company raising prices in other currencies to compensate for the strengthening of the US dollar, potentially reducing demand for its products. If in some cases, for some reason, the company decides not to raise prices, this negatively affects the profit that the company earns in US dollars: when converting foreign exchange earnings into US dollars, the company receives less (since the dollar has become more expensive).Importing companiesA strong dollar benefits US importers. With the growth of the dollar, imports for American companies become cheaper, and they can make more profit. For companies in other countries that import products from the United States – on the contrary, because they have to spend more of their currency to buy goods or raw materials.Commodity marketsPricing for most commodities occurs in the US dollar due to its role as the leading reserve currency. Local production costs and consumer prices can be expressed in different currencies, but for wholesale deliveries, the US dollar is used as a means of exchange. Over time, the growth of the dollar usually leads to a decrease in commodity prices, while the weakness of the reserve currency is a factor in the growth of prices in commodity markets. An increase in the DXY index leads to a decline in all commodity markets.Below is a graph of oil prices and the DXY index, which shows the inverse correlation of the dollar index with oil prices.In addition to the impact of the dollar's value on financial and commodity markets, it is worth mentioning separately the following global consequences for the economies of other countries:An increase in the debt burden on the budgets of countries that have dollar loans. After all, it is a well-known fact that the bulk of the world's debt obligations are denominated in US dollars. US banks actively lend not only to companies and businesses, but also to entire states. With the growth of the dollar, borrowers have to pay more on their debts.Emigration of capital from countries. When the national currency (other than the dollar) weakens, it forces large businesses and investors to withdraw funds from the economy of this country, which is an additional factor in the weakening of the local currency.Negative impact on economic growth. The effect of the dollar's growth is felt by importing companies, manufacturers who are heavily dependent on imported components from the United States. In the conditions of modern global globalization, it is difficult to find production facilities that are 100% provided by local markets. This is especially true for the production of complex technological products. To maintain output volumes at the same level, manufacturers need to spend more money on purchases, which often leads to losses. Therefore, a compromise option is to reduce the volume of output. On the scale of the country's economy, this means a drop in GDP.Pros and cons of the DXY Dollar IndexLike any other indicator, the US dollar index has its pros and cons:AdvantagesExtensive use of the index. The index is calculated around the clock.Availability of futures and options on the index. Index futures can act as a leading indicator of the movement of currency pairs. For example, if a bearish candle appears on his chart, it may mean that a surge will occur on the currency charts.Allows you to analyze the value of the dollar with more objectivity than the dynamics of a single currency pair.DisadvantagesA small number of currencies in the index, as well as a large proportion of the euro, which, when it fluctuates, leads to significant distortions and inadequate index values.It has stable power coefficients that do not correspond to the current modern structure of the US foreign trade turnover. The weights were last changed in 1999 after the introduction of the euro and have remained unchanged since then. However, much has changed in trade relations with the United States. For example, China, South Korea and Mexico have become key trading partners of the United States. The diagram below shows the structure of US foreign trade turnover in 2021:For a more adequate reflection of the US trade balance with other countries, the Fed calculates the Trade-weighted Dollar Index (TWDI). The basket of this index includes 26 currencies. Currency weights are recalculated annually. However, despite such a large number of currencies compared to the DXY index, the dynamics of the indices are almost the same due to the fact that the euro also has a lot of weight in TWDI.ConclusionThe US dollar index is a synthetic instrument reflecting the current dynamics of the price of the US currency. The index shows the strength or weakness of the US dollar more objectively than in relation to any one currency. This tool is used in their work by traders, investors, stock analysts. It gives a correct assessment of currency market trends and all assets in dollars. The global economic situation largely depends on the state of the American economy. The strength of the dollar can be considered as a temperature indicator not only of the US economy, but also of the global economy.The dynamics of the index indicates certain trends in the economy, but it is impossible to assess the current situation and trend by only one indicator. Moreover, the specificity of the index lies in the fact that the dynamics may indicate completely opposite trends – the dollar index shows its growth both during economic growth and during recessions. Therefore, the index can act as one of the tools in the investor's arsenal, but it is always necessary to conduct a comprehensive analysis of a number of macroeconomic ...