Yuan. 

Cash provided by operating activities was $4.2 billion, $3.9 billion, and $3.5 billion in 2012, 2011, and 2010. Our operating cash flows result primarily from cash received from our consumer, seller, and enterprise customers, advertising agreements, and our co-branded credit card agreements, offset by cash payments we make for products and services, employee compensation (less amounts capitalized related to internal use software that are reflected as cash used in investing activities), payment processing and related transaction costs, operating leases, and interest payments on our long-term obligations. Cash received from our consumer, seller, and enterprise customers, and other activities generally corresponds to our net sales. Because consumers primarily use credit cards to buy from us, our receivables from consumers settle quickly. The increase in operating cash flow in 2012, compared to the comparable prior year period, was primarily due to increases in non-cash expenses partially offset by the decrease in net income; additions to unearned revenue; and changes in working capital; partially offset by increased tax benefits on excess stock-based compensation deductions. The increase in operating cash flow in 2011, compared to the comparable prior year period, was primarily due to additions to unearned revenue; increases in sales of gift certificates to our customers; decreased tax benefits on excess stock-based compensation deductions; and the increase in net income, excluding depreciation, amortization, and stock-based compensation; partially offset by changes in working capital. 

Cash provided by (used in) investing activities corresponds with capital expenditures, including leasehold improvements, internal-use software and website development costs, cash outlays for acquisitions, investments in other companies and intellectual property rights, and purchases, sales, and maturities of marketable securities. Cash used in investing activities was $(3.6) billion, $(1.9) billion, and $(3.4) billion in 2012, 2011, and 2010, with the variability caused primarily by changes in capital expenditures and changes in cash paid for acquisitions, and purchases, maturities, and sales of marketable securities and other investments. Capital expenditures were $3.8 billion, $1.8 billion, and $979 million in 2012, 2011, and 2010, with the increases primarily reflecting the purchase of property in 2012, and additional investments in support of continued business growth due to investments in technology infrastructure, including AWS, and additional capacity to support our fulfillment 

operations during all three periods. We expect this trend to continue over time. The purchase of property in 2012 included the acquisition of 11 buildings comprising 1.8 million square feet of our previously leased corporate office space and three city blocks in Seattle, Washington for $1.4 billion. Capital expenditures included $381 million, $256 million, and $176 million for internal-use software and website development during 2012, 2011, and 2010. Stock-based compensation capitalized for internal-use software and website development costs does not affect cash flows.