请问side payment是什么意思
The overarching idea behind our analysis is that a contract guarantees what
will not happen, but not what will happen. That is, in writing an ex ante contract, the
parties restrict the set of outcomes over which they are free to bargain ex post: they tie
their hands (not always a good idea for a pianist). In particular, by fixing the price,
they deliberately rule out the kinds of side payments necessary for the Coase theorem
to work.This is the source of what is perhaps our most important finding:
equilibrium outcomes can be ex post inefficient even though information is
symmetric.