"In theory a new (Medicare prescription) drug benefit will cost $400 billion over the next decade. Even with higher deductibles and copayments, that price tag strikes many experts as unconvincingly small. ... The hard fact is that there will have to be `means testing' in any comprehensive prescription drug benefit. Some members of Congress recognize this fact and have proposed tying at least some prescription benefits to a senior citizen's income. That approach will have to be pushed further if a new drug benefit isn't to become a ticking fiscal time bomb."