How do you define market opportunity in a business plan?

"I define a market opportunity as the projected potential size of the market and sales. To find it, I'd estimate how many users are in my target market and how much in sales I could potentially make from that market. This is a big deal to a fintech product manager because it's crucial that we know for sure that there's a customer base that will buy our product before we go ahead and roll it out. When I consider a market opportunity, I think about its size, profitability potential, and the speed at which the market is growing (the compound annual growth rate or CAGR). It's also important to understand if there's a subsegment of the market that we might want to target, what our competitors' market share is, and if we already know anyone or any businesses in our target market who we can reach out to for insights and potential sales."