The graph is from a paper by Frank Gunter (The Journal of Economic Education, 2012, issue 4). He argues that principles of economics texts should pay more attention to entrepreneurship and explains how to do so. The abstract:
A draft is available here.The critical roles of entrepreneurs in creating, operating, and destroying markets, as well as their importance in driving long-term economic growth are still generally either absent from principles of economics texts or relegated to later chapters. The primary difficulties in explaining entrepreneurship at the principles level are the lack of a universally accepted definition, a plausible explanation of the demand for entrepreneurship, and a diagram that summarizes the impact of entrepreneurship on market equilibrium and growth—a definition, a story, and a picture. This article discusses how the notion of the stationary state associated with Schumpeter (1911/1983), Knight (1921/1971), and Weber (1930/2002) can provide a framework for integrating the entrepreneur into the early part of principles of economics courses.