Yields in the Treasury market are rising, threatening to make it more expensive for consumers and the U.S. to manage debt.

Moody's downgrade of the U.S. sovereign credit rating late Friday appeared to have a modest impact on corporate bond market activity on Monday, as spreads widened slightly and new bond sales started the week softer than expected.

NEW YORK (AP) — U.S. stocks are drifting lower, while U.S. bonds and the value of the U.S. dollar are falling more sharply on Monday following the latest reminder that the U.S government seems to be hurtling toward an unsustainable mountain of debt.