E-commerce giant Amazon surprised Wall Street last week by posting much higher earnings than expected for the fourth quarter of 2014: E-commerce giant Amazon surprised Wall Street last week by posting much higher earnings than expected for the fourth quarter of 2014: $0.45 per share versus analysts’ estimates of $0.17. In October, the company had posted a third-quarter loss of $437 million — its biggest loss in 14 years . In its latest report, Amazon cited growth in its Prime membership program as a main reason for the increase in profits. Following the announcement, the firm’s stock rose 13%. .45 per share versus analysts’ estimates of E-commerce giant Amazon surprised Wall Street last week by posting much higher earnings than expected for the fourth quarter of 2014: $0.45 per share versus analysts’ estimates of $0.17. In October, the company had posted a third-quarter loss of $437 million — its biggest loss in 14 years .…