Economics Insights @ CBS

We investigate the effect of discrete sampling and asset price jumps on fair variance and volatility swap strikes. Fair discrete volatility strikes and fair discrete variance strikes are derived in different models of the underlying evolution of the asset price: the Black-Scholes model, the Heston stochastic volatility model, the Merton jump-diffusion model and the Bates and Scott stochastic volatility and jump model.

We present a short geometric proof for the price of anarchy results that have recently been established in a series of papers on selfish routing in multicommodity flow networks. This novel proof also facilitates two new types of results: On the one hand, we give pseudoapproximation results that depend on the class of allowable cost functions. On the other hand, we derive improved bounds on the inefficiency of Nash equilibria for situations in which the equilibrium travel times are within reasonable limits of the free-flow travel times.

We establish five facts about prices in the U.S. economy: 1) For consumer prices, the median frequency of non-sale price change is roughly half of what it is including sales (9-12% per month versus 19-20% per month for identical items; 11-13% per month versus 21-22% per month including product substitutions). The median frequency of price change for finished goods producer prices is comparable to that of consumer prices excluding sales. 2) One-third of non-sale price changes are price decreases.

Four studies investigated whether activating a social identity can lead group members to choose options that are labeled in words associated with that identity. When political identities were made salient, Republicans (but not Democrats) became more likely to choose the gamble or investment option labeled "conservative." This shift did not occur in a condition in which the same options were unlabeled.