According to a 2020 US study, the cost of 10% minimum wage increases for grocery store workers were fully passed through to consumers as 0.4% higher grocery prices. Similarly, a 2021 study which covered 10,000 McDonald's restaurants in the US found that between 2016 and 2020, the cost of 10% minimum wage increases for McDonald's workers were passed through to customers as 1.4% increases in the price of a Big Mac. This results in minimum wage workers getting a lesser increase in their "real wage" than in their nominal wage, because any goods and services they purchase made with minimum-wage labor have now increased in cost, analogous to an increase in the sales tax.