"This is a commodity business and, as Meredith said, when companies cut back, the commodities are the first to go." For the six months ended June 30, Dollar Thrifty's net income fell 57.7 percent to $20.5 million, or 84 cents per diluted share, from $48.5 million, or $1.87 diluted, the prior year. Revenue increased 8.5 percent to $849.6 million from $721.17 million. In a roller-coaster day that dropped its shares $1.78, Dollar Thrifty stock closed Tuesday down 96 cents at $31.50. Volume totaled 1.16 million shares, three times its daily average.