Now how does welfare change as a result of finding a "better-0" variety of the crop? Suppose that the value of the attribute for which selection is

2 I am, then, implicitly supposing that income effects are not important. This assumption is probably not unreasonable when purchases of the commodity in question comprise a relatively small share of the consumer's budget. If we are talking about potentially catastrophic collapses in the yield of important crops, however, this assumption would be suspect.

3 It may be worth noting here that such improvements would also save on the social costs of pesticides employed, such as contamination of groundwater and incidental poisoning of beneficial organisms.

undertaken absent any efforts at improvement would be 0q. Then if a "type Of variety is planted, the change in welfare will be

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