What you describe only works for cash basis taxpayers. Public companies are all accrual basis taxpayers. Under accrual accounting increasing your inventory affects the financial statements as follows:
* Balance sheet: decreases cash/cash equivalents entry and increases the inventory balance sheet entry (in equal amounts), resulting in no change to net assets or equity
* Income statement: no effect
* Cash flow statement: will show up as a change to inventory, reducing operating cash flow and total cash flow