In 2014, after the
Seattle City Council passed an ordinance that would incrementally raise their minimum wage to $15 / hour, they issued a request for proposals for a research team to study the impact of the ordinance. The RFP asked for five years of continued research, but unusually did not include any funding, though the city allocated $100,000 for 2015 and nothing thereafter. Researchers at the
Evans School of Public Policy at the University of Washington were the only group of researchers to submit a proposal, and therefore won the contract. Their first paper in 2016 found that the minimum wage law was reducing job growth for low income workers. In 2017, after the mayor was presented with a draft of the second year's study from the UW group, he shared that pre-publication study with
Michael Reich's economics group at UC Berkeley and asked Reich's team to conduct another study on the effects of this ordinance which was released a week before the UW study was scheduled to be released, and (contrary to the UW study) found that Seattle's law was instead benefiting restaurant workers. Critics have noted that these events seem to show a clear intent by city leaders to undermine research that doesn't fit their narrative.
University of Washington First study The University of Washington published a study called "Minimum Wage Increases, Wages, and Low-Wage Employment: Evidence from Seattle" which focuses on evaluating the effects of the 2015 increase of the minimum wage to $11 per hour and the additional increase to $13 in 2016 on citywide employment and the number of hours worked. This paper examines the impacts the minimum wage increases had on all low wage employees across different industries and worker demographics in the state of Washington. This paper uses data from Washington's Employment Security Department, which collects quarterly payroll records for all employees paid wages in the state of Washington. Employers are obligated to report the number of hours worked by their employees. This data allowed the University of Washington to calculate average hourly wages and to identify the jobs and industries that have been affected by the increases to the minimum wage. The study excluded employment for multi-site businesses as the data collected from WESD were too difficult to locate and track as these businesses held more than one Unemployment Insurance account each. Workers with two jobs, an employer in Seattle and an employer outside of Seattle, on the minimum wage were also excluded as these workers were thought to only be partially affected by Seattle's minimum wage changes. Consequently, the paper investigation involved 53% of workers in Washington state earning less than $11 per hour in the first quarter 2015 and 53% of workers earning less than $13 per hour in the fourth quarter 2015.
Second study The University of California, Berkeley, released another study on September 6, 2018, called "The New Wave of Local Minimum Wage Policies: Evidence from Six Cities". This paper examines the impact of many new labour market policies that have been implemented across 6 large cities in US: Chicago, the District of Columbia, Oakland, San Francisco, San Jose and Seattle. All these policies are characterised by increasing the minimum wage to $12-$15 per hour. This study is similar to the one that preceded it, "Seattle's Minimum Wage Experience 2015-16", in that it focuses on the food services industry due to it being a large employer of low wage workers. The data used in this paper extended to late 2016 when Seattle's minimum wage had increased to $13 per hour. The control group used for comparison consisted of highly populated counties in metropolitan areas across the U.S. This paper used data from U.S. Bureau of Labour Statistics' Quarterly Census of Employment and Wages (QCEW). The employers that report their data on employment and wages to the QCEW are a part of the Unemployment Insurance system which includes more than 95% of jobs in the US. The 6 major cities in the study experienced strong private sector growth and economic expansion in comparison with the rest of the US during the period the employment data was collected. To prevent this strong growth from hiding any negative impacts of the minimum wage increase, the study isolated the causal effects of the local minimum wage policies by using
event study and
synthetic control methods. The evidence found suggested that low wage workers across the US, including Seattle, benefited from policy decisions to increase the minimum wage to a rate of pay between $10-$13. Earnings in the food services industry were found to have increased between 1.3% and 2.5% across the 6 cities as a result of a 10% increase in the minimum wage. The paper also couldn't find any negative impacts on employment across the 6 cities that would have resulted from a higher minimum wage. This study is only limited to food services industry, other low wage industry could have experienced different impacts on employment. == References ==