To expand on that. Most succesfull businesses I've seen started in my close circle indeed came from the job they had before. Most of them were not new product

To expand on that. Most succesfull businesses I've seen started in my close circle indeed came from the job they had before. Most of them were not new products, but either were what they were already doing or a variation or improvement of that. In that case you know your product and often already have it, know your market & know how to reach them. And often your former employer either becomes a client, or he is upset :). But that's maybe not really a startup. Creating a new product is often what is most difficult. It takes time to figure out what to create, who to create it for and even if it's a great product how can you affordably get enough new clients. That's a lot of stuff to figure out. So yeah it's way easier to expand on what you already know.