Current ratios and some related data for Apple Inc. in the last two fiscal years are as follows: 2012 2013 Current Ratio 1.50 1.68 Net Sales ($ millions) 156,508 170,910 Cash & Equivalents ($ millions) 10,746 14,259 Short Term Marketable Securities ($ millions) 18,383 26,287 Accounts Receivable, net ($ millions) 10,930 13,102 Other Current Assets ($ millions) 17,594 19,638 Long Term Marketable Securities ($ millions) 92,122 106,215 Current Liabilities ($ millions) 38,542 43,658 Profit Margin ($ millions) 26.67% 21.67% What is the best explanation for the increase in the current ratio in 2013