Presumably, by appropriately comparing the responses of the control and treatment groups, one can infer the impact of the various types of allowances upon housing behavior. However, suppose for the moment that experimental data were not available and that an investigator was asked to predict the effect that allowances would have upon housing behavior. Most likely the investigator would begin by noting that the housing-gap formula is essentially an increase in income, and the percentof-rent

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... la represents a change in the price of housing services from 3. The definition of "household income" was essentially posttax income less a $300 4. For example, in 1973 a Phoenix family with three or four members would be eligible deduction for each worker in the family. only if its income were less than $8,150; for Pittsburgh, the limit was $6,250.