Currency Risk
Hi Economist,
I don't think it's as simple as your post suggests.
First of all, take real estate - the reallest (if you'll pardon the Americanism) of all assets. Quite clearly, the future value of real estate for a € investor <!--EZCODE BOLD START--> is very definitely<!--EZCODE BOLD END--> affected by whether it's located in Chicago, Tokyo, London, etc. There is no evidence that I am aware of that a falling currency necessarily causes real estate prices to rise. Perhaps that is because (a) all other things are rarely equal (ie there are usually extraneous factors involved), and (b) the real estate market is not global in the way that equities and bonds are.
Turning to equities, your proposition is that Nestle, for example, is a global company which happens to be headquarted in Switzerland, not a Swiss company, and that the currencies which impact Nestle's share price are those in which it earns its profits, not that in which its shares are denominated. A weak Swiss Franc will cause Nestle's overseas earnings to be more valuable, and will balance for an overseas investor any losses due to the weak Swiss Franc itself. (A Swiss investor will simply gain from the overseas profits.)
This sounds entirely rational. But unfortunately it's not borne out by evidence. Empirical studies have revealed a very weak correlation between equity prices and currencies in developed markets - pretty much zero, in fact, whereas you suggest there should be a strong negative correlation. (Equity prices and currencies are hugely positively correlated for emerging markets, and for bonds.)
It's perhaps not surprising that the correlation is weak in the short term. Again there's a body of academic evidence that suggests that stocks in certain categories of assets (eg based on capitalisation, industry sector, geography, etc) move together because of investor demand. This is probably exacerbated by the growth of indexation, where investors choose to buy or sell baskets of securities with little or no emphasis on fundamentals. You'd expect the rational argument which you advance to win out in the long term, though, as fundamentals (ie actual earnings) reassert themselves into stock prices. But it doesn't appear to be the case.
So Nestle behaves more like a Swiss stock than a multinational with a similar earnings profile. European multinationals behaved more like German, French, or Italian stocks than multinationals. And the advent of the Euro has indeed therefore eliminated at least some degree of currency risk for European equity investors.