So Chrysler, GM and Ford will still be forced to make cars that dealers struggle to sell profitably, only many more of them.

WSJ: Review & Outlook: Halftime in Detroit

As a result, the foreign competition often operates at a cost advantage in the United States and in other markets that enables it to sell profitably at lower prices than U.S. firms can charge.

FORBES: Antidumping Reform Crucial to U.S. Competitiveness

Those achievements are more evidence that Apple's Mac strategy build premium machines, sell them profitably and don't obsess over market share doesn't mean that it can't end up with impressive market share anyhow.

CNN: Apple's Schiller: 'Old technologies are holding us back'

With Bunker C (No. 6) fuel cheap and gigantic containerized shipping available, a manufacturer could make any commodity with high tradability in any location in the world and sell it profitably anywhere else in the world.

FORBES: Four Reasons For The Jobs Crisis

Unfortunately, Solyndra could not sell its products profitably despite the government support and cheerleading.

FORBES: Obama Looking Like Job Killer In Chief

But all this is combining to push up prices to levels at which it may be hard for private-equity firms to sell their acquisitions profitably.

ECONOMIST: Private equity and technology

So what are some ways to get started on this most-important question: is there a solid reason to believe you can profitably sell enough people your product or solution at a price that makes it worth doing?

FORBES: Are You Making Something Usable? Part 4 -- But Is It Valuable?

To help manage my winning positions more profitably, I am always looking for sell signals while the stock price is still moving up.

FORBES: Mimic Buffett, Lynch And O'Neil With Rules-Driven Investing