All you would need is a computer in your home with an Internet connection. You could arrange for the products you sell to be shipped directly from the supplier to the customer. And that's just one example of a home-based business. Come up with your own idea for a home-based business. Describe the reasons why you think your idea is a good one.
Competitors can be both direct and indirect.
A video arcade also has indirect competitors since any other type of entertainment can lure away its customers, such as movies or amusement parks. Offering something new or unique can increase your chances of success. The only gas station in 50 miles is unique because of its location. You could have a unique business operation with no competitors and still not make money if too few customers want what you offer. Or, they want to buy it, but not at a high enough price to cover your costs.