Schoolchildren in the US are commonly taught to conceive of the broad variety of political-economic systems, both those extant and those possible, as divisible into two essential and opposing categories: “markets” and “planning.”
“Markets,” in this formulation, offer opportunities for commerce which make people free, while “planning” oppresses people through inefficient resource rationing.
It is taken for granted that “markets” and “capitalism” are synonymous; likewise “planning” and “socialism.” The problems with this formulation are legion, but particularly egregious is its utter ahistoricity: inconveniently for the schoolteachers formulation, markets predate capitalism by thousands of years.
See also socialist calculation debate.
I would (surprise surprise) prefer something that has a little bit of each - e.g. P2P accounting.