An economist is studying a country's labor market over the past two decades and observes four key trends: (1) The national unemployment rate has remained relatively stable. (2) Major industries have become more concentrated, with fewer large firms dominating their markets. (3) The percentage of the workforce belonging to labor unions has significantly declined. (4) The share of national income paid to workers as wages has decreased, while the share going to firm owners as profits has increased. Using a framework where firms set prices as a markup over costs and workers' wages depend on their bargaining power, explain how these four trends can be mutually consistent. Specifically, identify the two opposing pressures on the unemployment rate and the combined outcome for the real wage.