Loida Nicolas Lewis is on a roll. She has just won another $10 in a friendly wager with a colleague. After gleefully waving the crinkled bill in the air as though it were a winning lottery ticket, she ceremoniously places it inside a picture frame with six other flattened, face-up sawbucks. "He didn't think I could negotiate a lower lease, so I told him to put up or shut up," gloats Lewis. "They all second-guessed me, but I haven't lost a bet yet."
As chairman of TLC Beatrice International Holdings, which has the odd distinction of being America's largest minority-owned enterprise...