But how and to what extent we use socialist principles to regulate free markets remains an open question, and one that is answered very differently in, say, Sweden than in the United States. And this, I would argue, is where Marx still matters. Is capitalist competition natural and good, or should there be systems in place to check it for the sake of our collective well-being? Should we band together to provide health care for the sick or pensions for the old? Should governments run businesses, and if so, which ones? The mail delivery business? The airport security business?