Hence the question of this forum topic: "Why does the Left Fear Libertarianism"?
Answer:
A leftist can't win an economic argument against the right, because central planning fails.
Except for the proven track record of centrally planned nations having much better standards of living and faster growth than more "free market" nations (See: China, Sweden, Japan, India, almost any pre-revolution socialist Latin American country, etc.).
The real reason it's impossible to win an argument against the right is that the right has an illogically tendency to attitube all market success to the "free market" and all market failures to the market "not being free enough."