The VCs I work with often use a statistical method to find TAM. The data out there is extremely lacking and often incorrect. They find it by searching Google fo

The VCs I work with often use a statistical method to find TAM. The data out there is extremely lacking and often incorrect. They find it by searching Google for targets, making phone calls, gathering the correct questions to ask, asking them, then making statistical inferences about the total market in some area (big or small). They have a small army of analysts to complete the work.