What’s the best way to decide to sell your company?

Ben Horowitz (Co-Founder & Partner @ Andreessen Horowitz)
Should You Sell Your Company? – Ben’s Blog

When analyzing whether or not you should sell your company, a good basic rule of thumb is: If a) You are very early on in a very large market AND b) You have a good chance of being number 1 in that market, then you should remain stand-alone.