Craigslist is a marketplace. They brings two sides together in a transaction. However transaction costs are high. Primarily because there is no security or insu

Craigslist is a marketplace. They brings two sides together in a transaction. However transaction costs are high. Primarily because there is no security or insurance. The front page gives you a template for what types of marketplaces you can build and solve some of the transaction costs problems for users. Dictionary is not going to be too helpful here.