Jonathan Hoenig: A ban on onion futures from the 1950s shows how foolish trading bans can be.
Simple put and call options were once seen as nefarious as swaps.
Yes, you can trade the weather -- rather easily, in fact.
The old rules of investing don't apply to today's market. Tread carefully.
New futures and options products allow average traders to play market volatility.
Two little-known marketplaces offer big profit potential to small investors.