Kiiza Julius argues that mercantilism is an outdated economic theory that promotes protectionism and restricts free trade. He believes that mercantilist policies such as tariffs and subsidies only benefit a small group of individuals or industries at the expense of the overall economy. Julius also argues that mercantilism leads to inefficiency and hinders economic growth by limiting competition and innovation. He advocates for a more open and liberalized approach to trade that allows for greater market access and fosters economic development.