An excerpt from Chapter 1 of Capitalism: A Treatise on Economics, Volume I.

Economics has been defined in a variety of ways. In the nineteenth century it was typically defined as the science of wealth or of exchangeable wealth. In the twentieth century, it has typically been defined as the science that studies the allocation of scarce means among competing ends. [1]

I define economics as the science that studies the production of wealth under a system of division of labor, that is, under a system in which the individual lives by producing, or helping to produce, just one thing or at most a very few things, and is supplied by the labor of others for the far greater part of his needs. The justification of this definition will become increasingly clear as the contents of this book unfold. [2]

The importance of economics derives from the specific importance of wealth—of material goods—to human life and well-being. The role of wealth in human life is a subject that will be examined in Chapter 2 of this book, but provisionally its importance can be accepted on a common-sense basis. Obviously, human life depends on food, clothing, and shelter. Moreover, experience shows that there is no limit to the amount of wealth that practically all civilized men and women desire, and that the greatest part of their waking hours is actually spent in efforts to acquire it—namely, in efforts to earn a living.

Yet the importance of wealth, by itself, is not sufficient to establish the importance of economics.

https://www.capitalismmagazine.com/2021/04/capitalism-economics-division-of-labor-civilization/