Supppose X is steel and measured in units of 2000lb.tons; Y(our numeraire) is cloth and measured in units of 1000 square yards. Then before we choose units of X,P0 could be a number like 2.5 measured in units of cloth per unit of steel. Now measure steel in 800 lb.units rather than 2000 lb.units. By choosing units that we measure steel in appropriately, we now have P0equal to 1; that is , at given world prices 1000 square yards of cloth is worth 800 lbs. of steel.
1.x，铁，以2000lb.tons为单位; Y，cloth，以1000 square yards为单位.
2.在确定x单位数前，假定P0*1 unit of cloth =1 unit of steel（例如P0=2.5）
3.现在，设steel以800 lb为单位 , 令P0=1,即有在给定价格（P0）下， 1000 square yards of cloth is worth 800 lbs. of steel.
刚开始时,x(铁)以2000lb.tons为单位; Y(cloth)以1000 square yards为单位。那么在确定x单位数前，假定P0*1 unit of cloth =1 unit of steel（例如P0=2.5），此时也就是2.5*1unit of cloth =1*1 unit of steel
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