Attention is described as a “scarce commodity” that is traded in “a marketplace.” This, it is further claimed, contributes to a “widespread sense of attentional crisis.” But is there really an attention market, and if so, what, if anything, is wrong with it? We defend the claim that there are markets in attention. We provide an account of such attention markets and use that account to address what is morally wrong with them. Our account draws on knowledge of how attention works and what roles it plays in the mind. The attention market trades in an ability to influence our attention – somewhat (though not exactly) like the labor market trades in an ability to influence how we use our capacity for work. Specifically, the commodity it trades in is attentional landscaping potential, viz. the ability to systematically influence patterns of attention by changes to the sensory environment individuals are exposed to. Attention markets thus, we argue, commodify influence over a human capacity that plays a central role in shaping individual experience, agency, and belief formation. This feature of attention markets makes them ethically problematic. As markets in access to external influence, attention markets pose a special threat to individual autonomy and escape the classical liberal defense of free markets. Those who value autonomy should worry about the attention markets that exist today.