Hi Steve, I follow the book and don't use fixed minimums, but it is easy to add a constraint for a fixed minimum transaction value. Lichello replaced the fixed minimum buy/sell of $100 with the 5% minimum transaction(3rd edition). Page 265, 3rd edition: 'Make your minimum purchase or sale 5 percent of your Stock Value....' Page 54, 3rd edition describes the $100 rule. Kind Regards, K