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So let's say I want to invest in S&P 500 for five years from now. Will it be a logical investment if I am earning in Euros?

Her's why I am in a dilemma. If I invest into S&P today, then I am buying USD at a much lower rate. EURUSD is poised to go bullish in the coming years. I am not sure how much would the annual return be with the S&P, but I will be losing too because of the USD value plummeting.

Could someone suggest what would be the right thing to do?

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    "but I will be losing too because of the USD value plummeting." If the USD does not plummet, you'll kick yourself. – RonJohn Dec 6 '20 at 19:45
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When investing into stocks, the currency used has little effect. Exchange rates definitely do influence how a stock develops, but their influence is a bit more subtle.

When you use bonds or other debt-based investments, they are typically bound to a particular currency. In the simplest form: you give me $100 now, I give you $105 back in a year (5% annual return). Clearly this is subject to exchange rate risk if you actually want to invest in Euros – e.g. you might invest €80 now but get back €74 or €90 depending on how exchange rates develop.

But stocks are different. The value of stocks is of course listed in a currency for bookkeeping purposes, but their value is more abstract. One way to conceptualize the value of a company is the expected value of all their future profits plus their current assets, with some discounting to account for risks and opportunity cost. The share represent a fraction of ownership, and thus a fraction of the company's value.

There is of course an interaction between earnings and exchange rates. If a fast food chain sells 10 million menus for 5 USD during a month, that will be 50M USD. Exchange rates move, so you might not get the “same” value after conversion to Euros. No larger company is isolated to a single nation, but has international supply chains and international income streams. If the value of USD compared to EUR plummets, this fast food chain might have “higher” earnings from their European subsidiaries, and might also have “lower” costs when paying for supplies in USD. A lower exchange rate can increase international competitiveness. Changes in exchange rates are random (for our purposes) and it's effectively random whether you'll end up a “winner” or a “loser”.

I'm using a lot of scare quotes here because a lot here depends on viewpoint.

Another reason why exchange rate have little effect lies in how the value of stocks develops. Generally, the true underlying value (independent from accounting currency) develops not additively, but multiplicatively. E.g. a company might have a 20% chance of closing on a $50M contract. A rational investor would value this chance at $10M, and add +$40M to the valuation when the contract closes.

However, the ability of the company to close on the contract has substantial second-order effects. They are less likely to go bankrupt, making future earnings more likely. They might be able to grow their business by 10%. They might be able to invest in R&D. These underlying changes in the ability of the company to earn money are best modelled as percentage changes in their value, which happens to be entirely independent of currency.

So yes, it is quite rational for an EU investor to invest on an USD-denominated index. The currency doesn't really matter, the percentage changes in value matter. And whether exchange rate fluctuations make you a winner or a loser is pretty random – for USD:EUR they will likely stay reasonably small anyway (compared to the fluctuations in value of underlying stocks). The exchange rates may also affect the underlying value of companies, thus amplifying or dampening the effect of fluctuations – but you're subject to those effects regardless of how you invest into stocks.

There is another reason why an EU investor should invest into non-EU stocks: geographic and political diversification. If the EU economy collapses, the Euro and investments in EU companies might become fairly worthless. But non-EU investments would be less affected, and would be even more “valuable” when converted into EUR. You describe the opposite scenario, that the USD drops in value and you “lose” on your investment. But those two are sides of the same coin. You cannot avoid risk, but you can reduce risk by spreading it out further.

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You're right that you'll be taking on exchange rate risk when investing your hard-earned Euros into US Dollars.

In my opinion, now is a good time to do so, because the strong Euro allows you to buy more US Dollar denominated stocks. Goldman Sachs and other investment banks expect the Dollar to continue weakening in the near future as growth outside of the US picks up in 2021. This will weigh down on the value of your US Dollar denominated investments.

However, exchange rates move in cycles, and I would expect the Fed to start increasing interest rates ahead of the ECB, because the US economy typically bounces back faster than than others. This won't happen overnight, and could be 2+ years in the making. However, this will give your US Dollar denominated investments an edge at the time. This may even boost your return, depending on where exchange rates settle at that time.

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