What financial securities, a stock, a bond or a preferred stocks are more expensive to issue fro the firm's perspective?

The current ratio is a static measure. The value of the current ratio as a measure of liquidity is limited for the following reasons: future liquidity depends on prospective cash flows and the current ratio alone does not indicate what these future cash flows will be; there is no direct or established relationship between balances of working capital items and the pattern which future cash flows are likely to assume; managerial policies directed at optimizing the levels of receivables and inventories are oriented primarily toward the efficient and profitable utilization of assets and only secondarily at liquidity considerations. what the benchmark value for the current ratio?