多马模型中，资本平均生产率σ和s不同时，将出现资本弃置（junking process）为什么这时边际储蓄倾向会变大？在其原文中是这样说的，可我没看懂，求指点。

In this country, where saving involves little hardship, it may be perfectly justified. But it may present a serious obstacle to the achievement of full employment, because the owners of capital assets headed for the junk pile will try to avoid the losses. So long as they confine themselves to changes in their accounting practices, no special consequences will follow. But it is more likely that they will try to accumulate larger reserves either by reducing their own consumption or by charging higher prices (or paying lower wages). As a result, the total propensity to save may rise.