How to handle countries and currencies

Daniel Broby

INTRODUCTION

“We’re trying to extend the three-factor model internationally. The scientific approach is always to say: does it work out of sample? In other words, does it work on new data, in this case, foreign stocks?”

—Eugene Fama

This chapter explores how to handle countries and currencies. The very first indices were country indices. As the financial markets globalised, investors increasingly sought out indices that encompass international countries and currencies. While, on the surface, the treatment of countries might appear analogous to that of sectors and factors, a deeper examination reveals differences. For example, there are vast disparities in the sizes of individual national economies, and their respective corporate make-up can distort the index constituents and weightings. The index constructor, therefore, faces the critical decision of preserving the representativeness of countries, or prioritising capitalisation, as discussed in earlier chapters.

Definition 10.1. Country In the context of listed securities, the term “country” typically refers to the country of origin or incorporation of a company whose securities are traded on a stock exchange. The country of listing is

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