Valued at lower of cost or Net Reasonable Value (NRV) Systerm Perpetual periodic Perpetual What did I start with? (beginning inventory) What did I add to it? (purchases/product costs) What did I use or sell? What do I have now? (ending inventory) periodic what did I start with? what did I add to it? What did I use or sell? What do I have now? Purchase Inventory Accounts payable or cash Sell Accounts receivable or cash Revenue Cost of goods sold Inventory Manipulation FIFO- first acquired are the first sold LIFO- Last acquired are the first to be sold. Average Cost- every time you purchase you calculate a new average cost of a unit of inventory.