Why chickens go across street?

The Prelim version:

1. "Because the price of going across goes down, and the behavior obeys the Law of Demand."
2. "Because the Pareto optimal allocation is on the tangency of the other side of the street."
3. "It is the result of a unique SPE of the alternating bargaining game, the second chicken agrees the offer immediately in the first period and passes across."
4. "Although it is off the equilibrium path, going across is a best response to its own belief."

Good luck to those Macro prelimers!