I think the difference between my answer and Dan´s is because the way you phrased ¨start up¨ is a little ambiguous. I was assuming you meant ¨start up a business¨ or go into business for yourself. There is also the term ¨startup¨ used as a noun for a new business where you might still be an employee. (Dan and I both assumed your error in the writing was different: I assumed you did not complete the idea and he assumed you added the space.) Whether you are the only owner, a partner, or an employee, a new business is more risky than an established one. However, some types of businesses, like my little solo professional private practice, do not have such big startup costs, have barriers to competition due to licensing requirements, and have higher rates of success. Technology startups, like the kind that employ engineers are usually much costlier and much riskier.