The study casts doubt on unregulated over-the-counter products, although manufacturers argue that they may take more than one night to become effective.

Analysts and other manufacturers argue that this piece of the market is suicidal.

The manufacturer would later argue that the pilots took a bad situation, and made it worse.

The manufacturers, for their part, argue that they use the markup to underwrite research.

But those controls hurt business and should be eased, the high-tech manufacturers argued.

The manufacturers have been arguing against any further rate increases by the Fed, insisting that more will slow the economy too much.

Indeed, some manufacturers argue that their industry has already reached what one called a "subcritical mass" from which it cannot recover.

Korean manufacturers and the government argue that American automakers simply do not offer the right products.

The manufacturers then argued that the products were cosmetics, and the agency allowed them on the market but pending another review.