250 



SALES 

 PRICE 

 COST 



I I [ I I I I I I M I I I I I I I I I I I I I I I I I I i I I I I I I I I I I I I I I I I j I I l | I I I I I I I I I ' I I I I I I I I I I I I I I I I I I I M I I I I I 



J FMAMJ JASONDJ FMAMJ JASOND 



1967 1968 



Appendix Figure 5. — Fresh cod fillets — weekly retail prices, purchase costs, and sales volume from a Chicago food chain store with 20 



branches, 1967 and l%8. 



200 



c 



D 



o 

 a. 



i_ 



0) 



a 



c 



Sales 



PRICE 

 COST 



I I ! I I I I I I I I I I I I I I I I 1 I I I I I rrT -pr 



MAMJ J ASOND 



1967 



9 

 h8 



7 

 6 

 5 



4 



h2 

 2 

 ] 



-a 



c 



o 



Q. 



E 



O 



to 



Appendix Figure 6. — Frozen cod fillets — weekly retail prices, purchase costs, and sales volume from a Chicago food chain store with 



20 branches. 1967 and 1968. 



28 



