If you had $100k to start a new business today- what would it be?

100K is not enough to rent a street location, not enough to build a product. In the USA, 1 year of an employee's salary (approximately), in China, 1 year of a company burn. I would save the money. The local McDonalds owner would envy you, because he spend 2 million dollars to have the restaurant and this is 10 years of his take home profit from the restaurant. If you have the money to burn, I would go to Amazon and pick a really common items and use the 100K to burn a shop. Say T shirts, pants, shoes. If you know how to do it, it will get a self sustaining store - everyday you spend 1000 dollars to make 2000 kind of deal. Good luck. Just my two cents.