TY  - BOOK
AU  - Ruffin,Roy J
AU  - Gregory,Paul R.
TI  - Principles of economics
SN  - 9780673460202
U1  - 330 
PY  - 1990///
CY  - London: 
PB  - Foresman and Company, 
KW  - Economics
KW  - Elasticity
KW  - Monopoly
KW  - World Economics
ER  -