Economic Study Key PointsFor states, the selection of a economic study represents important policy decisions about their child support guidelines. A economic study typically involve an Estimation Method, Guideline Model and Expenditure Data (Source & Year)Since 1990, there have been at least 10 ten economic studies about children expenses used by states. But the majority of states use one of the four Betson-Rothbarth economic studies (Guideline Models State-by-State List)An attempt was made by PICSLT to further research on child expenditures but it did not receive support.