and 2010. We expect some variability in accounts payable days over time since they are affected by several factors, including the mix of product sales, the mix of sales by other sellers, the mix of suppliers, seasonality, and changes in payment terms over time, including the effect of balancing pricing and timing of payment terms with suppliers. 

We expect spending in technology and content will increase over time as we add computer scientists, software engineers, and merchandising employees. We seek to efficiently invest in several areas of technology and content such as digital initiatives and expansion of new and existing physical and digital product categories and offerings, as well as in technology infrastructure to enhance the customer experience and improve our process efficiencies. We believe that advances in technology, specifically the speed and reduced cost of processing power and the advances of wireless connectivity, will continue to improve the consumer experience on the Internet and increase its ubiquity in people’s lives. To best take advantage of these continued advances in technology, we are investing in initiatives to build and deploy innovative and efficient software and devices. We are also investing in AWS, which provides technology services that give developers and enterprises of all sizes access to technology infrastructure that enables virtually any type of business. 

Our financial reporting currency is the U.S. Dollar and changes in exchange rates significantly affect our reported results and consolidated trends. For example, if the U.S. Dollar weakens year-over-year relative to currencies in our international locations, our consolidated net sales, and operating expenses will be higher than if currencies had remained constant. Likewise, if the U.S. Dollar strengthens year-over-year relative to currencies in our international locations, our consolidated net sales, and operating expenses will be lower than if currencies had remained constant. We believe that our increasing diversification beyond the U.S. economy through our growing international businesses benefits our shareholders over the long term. We also believe it is useful to evaluate our operating results and growth rates before and after the effect of currency changes. 

In addition, the remeasurement of our intercompany balances can result in significant gains and charges associated with the effect of movements in currency exchange rates. Currency volatilities may continue, which may significantly impact (either positively or negatively) our reported results and consolidated trends and comparisons. 

For additional information about each line item summarized above, refer to Item 8 of Part II, “Financial Statements and Supplementary Data—Note 1—Description of Business and Accounting Policies.” 

Critical Accounting Judgments 

The preparation of financial statements in conformity with generally accepted accounting principles of the United States (“GAAP”) requires estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and related disclosures of contingent assets and liabilities in the consolidated