<P>刚开始学,还没摸着门呢。。。</P>
<P>buyer--seller <BR>seller production cost=random variable <BR>buyer's value=v(b),v'>0,v''<0 <BR>lim(b趋向0)v(b)=0,lim(b趋向无穷大)v(b)=c的平均数 <BR>Q <BR>1) show the condition for the first best level of investment. <BR>2) w/o contract, what is the level of investment? <BR>3) to achieve efficiency,what is the price of a contract?</P>