There's more than just a little rumbling over the Sarbanes-Oxley act--since it's become law in the U.S. Many say it's hurting companies with all of its compliance requirements--and hurting the stock market--particularly IPO's.

But CNBC contributor Herb Greenberg says--hold on. The law might not be so bad--especially for IPO's. He says on Power Lunch--that there are too many companies going public--when they should remain private. What's the rush he says? He points to IPO stock evaluations as proof of his point.

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