Crusoe spends so much time trying to catch five fish for the day that the only way he can invest in better tools (improved intermediate goods) is to cut back on current production. In other words, he has to “save” some of his effort instead of expending it all catching fish. This requires him to decrease his fishing time and catch perhaps only three fish a day (which means he’s going to be hungry), so he can spend the remainder of his day making a simple boat out of a hollowed log and a fishing net woven from vines. The process takes weeks, all the while Crusoe foregoes full satisfaction of
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