Purpose The purpose of this paper is to examine the literature on angel investors. Research on angel investors is sparse because data are sparse. Most comprehensive studies of angel investors have focused on the USA and UK. In these studies, definitions of angel investors and estimates of...

"Market imperfections affect virtually every transaction in some way, generating costs that interfere with trades that rational individuals make, or would make, in the absence of the imperfection. Understanding these costs gives us insight regarding the total costs of transactions, where to...