Market overreaction or hedging?

First off, let me state that I am a huge fan of markets. I think they are fairly semi-strong form efficient (not perfectly so), but can get caught up a bit with fads, etc. Inactive markets are particularly prone to such mispricing since there are not enough "arbitragers" (And here I am using Thaler's view that is not necessarily a risk free arbitrage) to "fix" items that are priced incorrectly.