The Shadow of Entrepreneurship Jay Jiyuan Wu ∗ July 5, 2018 Abstract We face two challenges in developing integrated entrepreneurship framework: A weak philosophical underpinning and a lack of common denominator to unite one-sided views into a balanced framework. The remedy for the former is “mixed entities,” while for the latter it is “constraints.” Every entrepreneurship project, every entrepreneur and every en- trepreneurial opportunity is a mixed entity, containing subjectivity and objectivity compo- nents. More importantly, ontology of all entities is changeable rather than predetermined by origin. Natural and social sciences differ by rudimentary facts or structures related to origin but share most others. Constraints are intolerable limitations against entrepreneurs’ insatiable desires for positive changes, and are a shadow by the side of entrepreneurship. The constraint based conceptual framework redefines entrepreneurship as continuous efforts to reduce/remove existing constraints, entrepreneurs as the leaders in lifting con- straints, and entrepreneurial opportunities as constraint-lifting possibilities. We compare constraints with opportunities, how mixed entities affect philosophy of sciences, espe- cially the comparison between natural and social sciences. Both conceptual and measure- ment models for ontology of entrepreneurship are offered in the end. Keywords: Mixed entities, Constraints, Ontology of entrepreneurship, insatiability, intol- erability, Constraint based entrepreneurship, opportunities * JFK University, Pleasant Hill, California