As discussed by Nistotskaya and D'Arcy in Chapter 2 on Sweden, a long tradition of generally high-quality institutions has paved the way for excellent state capacity. This chapter focuses on the twentieth century, a time when Sweden developed into a high-tax-rate country with extraordinary tax compliance—a unique combination. Sweden underwent a profound transformation in the middle of the twentieth century: The Social Democratic Party (Socialdemokratiska arbetarpartiet, or SAP) won the 1932 election and stayed in office for forty-four consecutive years. High union density and corporatism introduced in the postwar period gave extensive powers to the union movement and to employers' organizations. The “golden age” of social democracy—the 1950...