The markets are a powerful economic coordination mechanism. Even so, their limitations cannot, and should not, be ignored. The wide range of costs originating from business activities within the framework of capitalism and subsequently externalised or, more accurately, transferred to other agents or to society as a whole with no repercussions on the price mechanism, is one particularly striking example of these limitations. This article contrasts the different concepts of social costs existing in economics literature, ranging from the identification of the problem as a “market failure” to the more heterodox (and less well-known) concept of K. William Kapp, according to whom social costs are an intrinsic and inevitable problem within the ins...