Ron sells commercial-grade tools to building contractors. whenever he visits his customers, he looks to see whether they are using his tools for other tasks or have modified the tools for some other purpose. these customers are who can provide ideas for new and improved products. a. lead usersb. market testersc. concept testersd. reverse engineerse. early adopters

a. lead users

Explanation:

Lead users -

The term lead users was coined by  Eric von Hippel .

And it is defined as , the user of a product or commodity or service , which is still not publicly available and these users innovate or modify according to their convenience .

Same is the case with data given in the question , the customers are the Lead users , who give new innovative ideas to improve or modify the product .

it's actually a very difficult task, due to not many people can make 2 million dollars in 2 years. besides that, to the not-so-realistic ideas, you can create a business. it could be practically anything, but make it into a business that isn't that known yet, you get me? also, lets not forget about stock market. that's where all the good stuff happens. use investments at the beginning and begin to raise up your business or whatever you're going to do. as this is a very non-realistic idea, it's still worth the shot!