This paper analyses the relationship between monthly observations on farm level and retail level prices of three meats, seven fresh vegetables, five fresh fruits, eggs and cereals over the 1970's. A priori reasoning and results of Sim's casuality tests suggest that in most cases changes in farm prices cause changes in retail prices rather than the reverse or a simultaneous relationship. Markup price relationships are estimated. Most of the variation of retail prices is explained by the current farm price, lagged farm prices, a wage variable, and last period's retail price of a substitute product.
