Retailing experts said there was anecdotal evidence that retailers, partly due to promotions and sales, were seeing strong traffic in the lead-up to biggest shopping season of the year. The shopping rush was another sign that US consumers, helped by interest rates at their lowest in 40 years, oil prices at two-year lows and the prospect of a $100bn (£66bn) economic stimulus package from Congress, could be a prime force in lifting the world's biggest economy out of its year-long slump.