The History Of Finance: An Eyewitness Account

In this account of the evolution of finance theory, the “father of modern finance” uses the series of Nobel Prizes awarded finance scholars in the 1990s as the organizing principle for a discus‐sion of the major developments of the past 50 years. Starting with Harry Markowitz's 1952 Journal of Finance paper on “Portfolio Selection,” which provided the mean‐variance frame‐work that underlies modern portfolio theory (and for which Markowitz re‐ceived the Nobel Prize in 1990), the paper moves on to consider the Capi‐tal Asset Pricing Model, efficient mar‐ket theory, and the M & M irrelevance propositions. In describing these ad‐vances, Miller's major emphasis falls on the “tension” between the two main streams in finance scholarship: (1) the Business School (or “micro normative”) approach, which focuses on investors ‘attempts to maximize returns and cor‐porate managers’ efforts to maximize shareholder value, while taking the prices of securities in the market as given; and (2) the Economics Depart‐ment (or “macro normative”) approach, which assumes a “world of micro optimizers” and deduces from that assumption how the market prices actually evolve. The tension between the two ap‐proaches is resolved, and the two streams converge, in the final episode of Miller's history–the breakthrough in option pricing accomplished by Fischer Black, Myron Scholes, and Rob‐ert Merton in the early 1970s (for which Merton and Scholes were awarded the Nobel Prize in 1998, “with the late Fischer Black everywhere ac‐knowledged as the third pivotal fig‐ure”). As Miller says, the Black‐Scholes option pricing model and its many successors “mean that, for the first time in its close to 50‐year history, the field of finance can be built, or…rebuilt, on the basis of ‘observable’ magnitudes.” That option values can be calculated (almost entirely) with observable vari‐ables has made possible the spectacu‐lar growth in financial engineering, a highly lucrative activity where the prac‐tice of finance has come closest to attaining the precision of a hard sci‐ence. Option pricing has also helped give rise to a relatively new field called “real options” that promises to revolu‐tionize corporate strategy and capital budgeting. But if the practical applications of option pricing are impressive, the op‐portunities for further extensions of the theory by the “macro normative” wing of the profession are “vast,” in‐cluding the prospect of viewing all securities as options. Thus, it comes as no surprise that when Miller asks in closing, “What would I specialize in if I were starting over and entering the field today?,” the answer is: “At the risk of sounding like the character in ‘The Graduate,’ I reduce my advice to a single word: options.”