2012/06/20 by G. Charles-Cadogan, Charles-Cadogan, G.
Economics, Econometrics and Finance · #91G10 #91G70 #Economic theories and models #FOS: Economics and business #Financial Markets and Investment Strategies #Housing Market and Economics #Portfolio Management (q-fin.PM) #Risk Management (q-fin.RM) #Stochastic processes and financial applications #msc:91G10 #msc:91G70 #q-fin.PM #q-fin.RM
paper · pdf · doi:10.48550/arxiv.1206.4562
22 pages, 1 figure
arxiv created 2012/06/20 · openalex publication_date 2012/06/20 · arxiv updated 2012/06/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present conditions under which positive alpha exists in the realm of active portfolio management- in contrast to the controversial result in Jarrow (2010, pg. 20) which implicates delegated portfolio management by surmising that positive alphas are illusionary. Specifically, we show that the critical assumption used in Jarrow (2010, pg. 20), to derive the illusionary alpha result, is based on a zero set for CAPM with Lebesgue measure zero. So conclusions based on that assumption may well have probability measure zero of occurrence as well. Technically, the existence of [Tanaka] local time on a zero set for CAPM implies existence of positive alphas. In fact, we show that positive alpha exists under the same scenarios of "perpetual event swap" and "market systemic event" Jarrow (2010) used to formulate the illusionary positive alpha result. First, we prove that as long as asset price volatility is greater than zero, systemic events like market crash will occur in finite time almost surely. Thus creating an opportunity to hedge against that event. Second, we find that Jarrow's "false positive alpha" variable constitutes portfolio manager reward for trading strategy. For instance, we show that positive alpha exists if portfolio managers develop hedging strategies based on either (1) an exotic [barrier] option on the underlying asset - with barrier hitting time motivated by the "market systemic" event, or (2) a swaption strategy for the implied interest rate risk inherent in Jarrow's triumvirate of riskless rate of return, factor sensitivity exposure, and constant risk premium for a perpetual event swap.