Marketwatch Opinion: Every time we look at households' preparedness for retirement, we find that two-earner couples are in the worst shape. We generally attribute their status to the fact that one-earner couples receive a Social Security spouse's benefit equal to 50% of the breadwinner's while most two-earner couples do not. A recent study, however, suggests another problem: two-earner couples often do not save enough through their 401(k) plans. Read full...