SAN FRANCISCO Consumers heeded the call of online retailers on Cyber Monday, ringing up double-digit sales growth on that key e-commerce holiday shopping day, according to data released yesterday.

At least three companies reported surging sales on Monday, exceeding expectations in a consumer environment still tempered by high unemployment and worries over the economy.Online same-store sales, which measure web retailers active for more than a year, rose 36 percent from the prior year, according to ChannelAdvisor, which helps retailers maximise web selling.

ChannelAdvisor said same-store sales for their retail clients selling wares on Amazon.com Inc rose 98.1 percent, while those on eBay Inc rose 14.6 percent.

Amazon the world’s largest online retailer whose shares rose to an all-time high on Monday is widely expected to be the primary beneficiary of robust online sales this holiday.

In a separate report, IBM Coremetrics said US online sales rose 19.4 percent from Cyber Monday 2009, with the average value of orders up 8.3 percent.