Conducting the first study of momentum impact on households' ETF trading behavior, we find that Finnish households are less contrarian when trading benchmark index ETFs than when trading common stocks. Also, their propensity to chase recent positive momentum is higher when purchasing ETFs than...

We introduce a theoretical model of the active fund management industry (AFMI) in which performance and size depend on the AFMI's competitiveness (concentration). Under plausible assumptions, as AFMI's concentration decreases, so do fund managers' incentives for exerting effort in search of...

Volatility models of the market portfolio's return are central to financial risk management. Within an equilibrium framework, we introduce an implementation method and study two families of such models. One is deterministic volatility, represented by current popular models. Another is in the...

We introduce continuous-time rational models of concentration in the active fund management industry (AFMI), where managers with heterogeneous dynamic unobservable abilities compete for investments of risk-neutral or risk-averse investors. Dynamics of managers’ inferred abilities determine...