来自《耶鲁大学开放课程：金融理论 第4集 第4集》

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  He's got 1 unit up here of X and 2 units of Y.
  他有一个X的单位和两个Y的单位
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  Why does he have that?
  为什么他会这样呢
• 
  
  Why does he have that?
  为什么他会这样呢
• 
  
  Because the two together added up to 3, so if this is what A's
  因为总共是三 所以这是A的投资
• 
  
  Because the two together added up to 3, so if this is what A's
  因为总共是三 所以这是A的投资
• 
  
  endowment was then of course what's left over is B's endowment.
  理所当然地剩下的就是B的投资
• 
  
  endowment was then of course what's left over is B's endowment.
  理所当然地剩下的就是B的 投资
• 
  
  So B has to go here.
  那么B从这里开始
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  So B has to go here.
  那么B从这里开始
• 
  
  Now what does the budget set look like for B?
  那B的预算集应该是怎么样呢
• 
  
  Now what does the budget set look like for B?
  那B的预算集应该是怎么样呢
• 
  
  Well it's also a linear thing with the same slope and it goes
  它应该也是一条相同斜率的直线