Many economic models have attempted to represent the dynamics of entrepreneurship, but, in general, these studies focus on specific characteristics of the phenomenon without analyzing it as a whole immersed in a social system. This paper addresses the emergence of the entrepreneurial activity in a society, in which there are diverse opportunities for both employment and entrepreneurship; in order to do that, we develop an agent-based simulation, that uses heuristics based on thresholds for decision making. We find that both economy growth and average wages increase contract entrepreneurial activity, while opportunities rate increase and failure rate decrease have a positive impact on this activity. Thus, policies aimed at reducing the failure rate will increase proportionally the rate of entrepreneurs in society, while other policies that attempt to increase the number of opportunities will have a minor impact on the rate of entrepreneurship, becoming less efficient measures.