All of WSIPP's research is published on our website. The Publications page includes every report we've released—from our founding in 1983 to the present. Each report entry includes the title, publication date, abstract, any available supplemental materials, and a downloadable PDF.
WSIPP reports are not updated after publication, and any report older than two years is designated with an “Archived” label.
To explore our benefit-cost and meta-analytic findings, please visit the Benefit-Cost section of the website.
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By looking at the changing economic circumstances of Washington families over a four-year period, we found changes in annual family income to be common. Such changes in income are called "income mobility." Over the period we studied, increases in family incomes were more common than decreases; national studies have reported similar findings. Our state's longitudinal study, the Family Income Study, allows us to see income mobility over four years (1988-1991) among low-income families in Washington State.