The process of the entrepreneurial decision is decomposed in seven engagement levels ranging from "never thought about starting a business" to "gave up", "thinking about it" , "taking steps for starting up" , "having a young business" , "having an older business" and "no longer being an...

Two-sided markets are the new issues in economic theory and have been studied since the beginning of the 21th century. Barriers to entry are also important to provide a balanced full competition condition in markets. Generally, incumbent firms don’t want new rivals because new rivals usually...