假定图6—15代表的是两时期模型中两个大国在第一个时期的情况。那么，第二个时期该图会有什么变化？

Assume that Figure 6—14represents the situation of two large countries in the first period 0f the two—period model．What would the diagrams look like in the second period？Which curves would have t0 shift s0 that the two countries maximize their welfare subject to their intertemporal budget constraint？