I wonder what a 50% failure rate says about the level of success among the remaining companies. Traditional conventional wisdom was that only 10% of startups su

I wonder what a 50% failure rate says about the level of success among the remaining companies. Traditional conventional wisdom was that only 10% of startups suceeded, but they succeeded spectacularly (more than 10x return on investment). Does this imply that a lot of "successful" companies are generating very modest returns on investment?