British Investment Overseas 1870-1913: A Modern Portfolio Theory Approach

Many scholars have asked whether British investors benefited from overseas investment investing in the 19th century and whether this export of capital had negative effects. We re-visit the issue using modern portfolio theory. We examine the set of investment opportunities available to British investors, the developments in information transmission technology, and advances in financial and investment theory at the time. We use mean-variance optimization techniques ot take into account the risk and return characteristics of domestic and international investments available to a British investor, and to quantify the beneifts from international diversification. Evidence suggests that capital export was a consequence of both the opportunity and the understanding of diversification.