,000 



500 



CO 



"o 



"O 



*♦- 



SlOO 



o 

 to 



o 



50 



10 



D □ SOCCOST 



PUBCOST 



^ ^PRICOST 



^C 



< if <W <ll /s^H ,-^11 \if ^\i> /\1l SS^I ^H 





Objective function 



Figure 3.2. Effect of objective optimized on public costs (PUBCOST), private 

 cost (PRICOST), and combined public and private costs (SOCCOST). 

 (Lines connecting points are descriptive and should not be inter- 

 preted to represent a continuous function.) 



16 



