SHOULD THE U.S. REPLACE DOLLAR BILLS WITH COINS?

Linking here to consumerism commentary which is from WALL STREET JOURNAL MAGAZINE.

"The government’s assumptions and values used in this study are fascinating. Here are a few: Because coins circulate more slowly than bills, 1.5 coins will be needed for every 1 bill (note) .Dollar bills have a lifespan of 40 months while coins have a lifespan of 34 years. A dollar bill costs 2.7 cents to produce while a dollar coin costs 15 cents each. There are 9.5 billion dollar bills in circulation today. There are 3 billion dollar coins in circulation today, with an additional billion in Federal Reserve vaults (not quite a collectible item)."

WHATEVER HAPPEN TO THE SUSAN B ANTHONY DOLLAR COIN? I recall that these were minted and then no one seemed to want them for change. I used mine at the post office stamp machine!