In a communist society, people don't own property. There are no free markets.
It's ironic, but Marx would agree with a lot of the arguments being made by right wingers who include 'communism' and 'equality of outcomes' in their rhetoric (except for what communism is implied to be):
Here, obviously, the same principle prevails as that which regulates the exchange of commodities, as far as this is exchange of equal values. Content and form are changed, because under the altered circumstances no one can give anything except his labor, and because, on the other hand, nothing can pass to the ownership of individuals, except individual means of consumption. But as far as the distribution of the latter among the individual producers is concerned, the same principle prevails as in the exchange of commodity equivalents: a given amount of labor in one form is exchanged for an equal amount of labor in another form.
Hence, equal right here is still in principle – bourgeois right, although principle and practice are no longer at loggerheads, while the exchange of equivalents in commodity exchange exists only on the average and not in the individual case.
In spite of this advance, this equal right is still constantly stigmatized by a bourgeois limitation. The right of the producers is proportional to the labor they supply; the equality consists in the fact that measurement is made with an equal standard, labor.
But one man is superior to another physically, or mentally, and supplies more labor in the same time, or can labor for a longer time; and labor, to serve as a measure, must be defined by its duration or intensity, otherwise it ceases to be a standard of measurement. This equal right is an unequal right for unequal labor. It recognizes no class differences, because everyone is only a worker like everyone else; but it tacitly recognizes unequal individual endowment, and thus productive capacity, as a natural privilege. It is, therefore, a right of inequality, in its content, like every right. Right, by its very nature, can consist only in the application of an equal standard; but unequal individuals (and they would not be different individuals if they were not unequal) are measurable only by an equal standard insofar as they are brought under an equal point of view, are taken from one definite side only – for instance, in the present case, are regarded only as workers and nothing more is seen in them, everything else being ignored. Further, one worker is married, another is not; one has more children than another, and so on and so forth. Thus, with an equal performance of labor, and hence an equal in the social consumption fund, one will in fact receive more than another, one will be richer than another, and so on. To avoid all these defects, right, instead of being equal, would have to be unequal.
Critique of the Gotha Programme
When Kamala starts suggesting ideas that are distinct to communism, like that we'd be better off without free markets, or getting rid of the concept of private property, then it would make sense to call her a communist.