TONIGHT'S MUST-SEES

“SHARK TANK” SEASON-FINALE, 7 P.M., ABC

Spare and simple, this show has drawn viewers because of its real-life stakes. Entrepreneurs bring ideas to five wealthy investors, who may or may not provide money.
Tonight, we meet a very likable couple, thinking small. These people make their “Mr. Poncho” – a covering for a music-player, complete with a place to wrap the earphone cord – in their apartment.
We also meet a rather unlikable duo, thinking big. They expect millions from a Web site for college sports recruiters.
Other ideas cause a stir, from personalized bobble heads to a fake golf club that's a discreet (well, semi-discreet) urinal on the fairway. Ideas and schemes bounce around in an entertaining hour.

“FRONTLINE: THE WARNING,” 9 P.M., PBS

Alan Greenspan's strongest influence was Ayn Rand, the author who once explained: “I am for an absolute laissez-faire, free, unregulated economy.”
That was odd because Greenspan's job – for Republican presidents and Bill Clinton – was to regulate the economy. He wanted to let it heal itself; Brooksley Born disagreed.
As head of the Commmodity Futures Trading Commission, she was wary of derivatives. “My staff began to say how big this was,” she says here “and how little information they had about it.”
Born's powers were taken away. Now – after the troubles she'd warned of – here's an interesting look.

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