fluctuations. 

As of December 31, 2008, we had approximately $368 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under our plans. This cost is expected to be recognized over a weighted-average period of 1.7 years as stock-based compensation expense. This expected cost does not include the impact of any future stock-based compensation awards. Refer to Note 15 of Notes to Consolidated Financial Statements. 

The significant decline in the equity markets precipitated by the recent credit crisis and financial system instability has negatively affected the value of our pension plan assets. As a result of this decline, along with a decrease in the discount rate, our 2009 pension cost will increase by approximately $100 million. Our pension cost in years beyond 2009 may also be impacted by these changes. In addition, as a result of the decline in fair value of our pension plans assets and a decrease in the discount rate used to calculate pension benefit obligations, we have made and will consider making additional contributions to our U.S. and international pension plans in 2009. Refer to the heading "Liquidity, Capital Resources and Financial Position—Off-Balance Sheet Arrangements and Aggregate Contractual Obligations" and Note 16 of Notes to Consolidated Financial Statements for further discussion. 

Selling, general and administrative expenses increased $1,514 million, or 16 percent, in 2007 compared to 2006. This increase was primarily related to continued investments in marketing, increased costs to drive growth in our consolidated bottling operations, including a 6 percent increase related to the acquisitions and consolidations of certain bottling operations (refer to Note 20 of Notes to Consolidated Financial Statements), increased sales and service costs for certain brand acquisitions and a 4 percent increase due to foreign currency fluctuations. Selling and advertising expenses increased 20 percent in 2007 compared to 2006, on a combined basis. The increases in selling and advertising expenses were primarily related to increased investments in marketing and innovation activities, including the reinvestment of certain general and administrative expense savings derived from productivity initiatives. Selling and advertising expenses also increased due to costs to drive growth in our consolidated bottling operations, including a 6 percent increase related to the acquisitions and consolidations of certain bottling operations and a 4 percent increase due to foreign currency fluctuations. General and administrative expenses increased 8 percent in 2007, primarily due to increased costs in our consolidated bottling operations, including a 4 percent impact relating to the acquisitions and consolidations of certain bottling operations, increased costs related to our short-term incentive plan based on the Company's financial performance, and a 3 percent increase due to foreign currency fluctuations. These increases in general and administrative expenses were partially offset by expense savings generated through productivity initiatives and a decrease of approximately $82 million in