DENVER -- Vendors and businesses in a downtown Denver pedestrian mall are reporting mixed sales results, despite an influx of people this week for the Democratic National Convention.

Bret Goodman owns Jerri's Tobacco and Fine Wine shop, in the Denver Pavilions at one end of the 16th Street Mall. He says he's seen a double-digit bump in sales since Sunday.

Goodman credited the increase to his specialty merchandise, but said some fellow business owners have been less fortunate.

Since 9/11, national political conventions haven't proven to be the economic boon they once were.

Costs have mounted with increased security. And disruptions ranging from protests to heavy traffic can deter locals from visiting businesses near convention sites.

Denver is hoping the Democratic convention will provide an economic boost ranging from $150 million to $200 million. Other economists believe the impact may be as little as one-tenth of that amount.