10. Supplemental Information 11. Inventories Cost of sales of $7.3 billion (2011 – $6.6 billion) include $7.1 billion (2011 - $6.3 billion) of inventories recognized as an  expense during the period. Total inventories held at net realizable value amounted to $88 million at December 31, 2012 (2011 - $237 million). Total  inventory write-downs were $21 million (2011 - $38 million) during the period and were included as part of cost of sales. Long-term inventories consist of ore stockpiles and other in-process materials that are not planned to be processed  within one year. Generations 97 December 31, December 31, (Cdn$ in millions) 2012 2011 Raw materials $ 239 $ 190 Supplies 521 455 Work in-process 550 475 Finished products 626 572 1,936 1,692 Less long-term portion (Note 12)  (56) (51) $ 1,880 $ 1,641 (Cdn$ in millions) 2012 2011 Net change in non-cash working capital items and other Trade accounts receivable, taxes receivable and other  $ (119) $ (243)  Inventories (220) (304) Trade accounts payable, taxes payable and accrued liabilities  (49) (127) $ (388) $ (674) Income and resource taxes paid  $ 578 $ 823 Non-cash financing and investing transactions Shares received from dispositions  $ 4 $ 9 December 31, December 31, (Cdn$ in millions) 2012 2011 Cash and cash equivalents  Cash $ 144 $ 1,057 Money market investments with maturities from the date of acquisition of three months or less  3,123 3,348 $ 3,267 $ 4,405