Inventory overstate means a company reports more inventory value than it actually has, leading to an artificially lower Cost of Goods Sold (COGS) and consequently an inflated Net Income and Equity for that period; this error carries forward, overstating beginning inventory and understating gross profit in the next period, before eventually correcting itself over two years. Common causes include counting errors, double-counting, or including consigned goods, affecting financial statements like assets, profit, and retained earnings.