Sales of the PlayStation 3 video game console jumped in the weeks after a $100 price cut last month, Sony Corp's top PlayStation executive said. "We are up about 300 percent over where we were pre-price drop," Jack Tretton, chief executive of Sony Computer Entertainment of America, said in an interview. He noted that higher demand for the PS3 could leave some retailers out of stock."If things continue at this pace, it is conceivable that there will be product shortages," Tretton said. The increase represents sales of the console in the three weeks after Sony slashed the price of the PS3, whose sales have lagged behind Nintendo Co Ltd's Wii and Microsoft Corp's Xbox. A few days after Sony's price cut, Microsoft also dropped the price of its Xbox 360 Elite.