This document discusses different types of informal risk capital and venture capital for financing businesses at various stages of development. It outlines three main types of funding sources: early stage financing, development financing, and acquisition financing. The informal risk capital market, venture capital market, and public equity market are described as potential sources of funds, though public equity is generally only available for high-potential ventures. The stages of business development funding from seed/angel investors to venture capital to private equity are then explained in more detail.