Efficiency with regard to what goal? The current allocation of capital in the US is quite inefficient if we're interested in the welfare of the public. Billionaires have far more capital than they know what to do with, and since they're unaccountable for their investment choices, they strongly tend to steer the economy toward vanity projects. Meanwhile, many families can't put food on the table, and infrastructure is falling apart.
Whatever it is about this system that you find "efficient," I don't find it valuable. The Chinese state takes a rather strong hand in allocating capital, and that has treated it fairly well over the past few decades. A mixed economy where private capitalists are not solely responsible for investment choices, and where ownership of that capital is more evenly distributed among the public, could fix a lot of problems.