A liquidity ratio is an indicator of whether a company's current assets will be sufficient to meet the company's obligations when they become due. The liquidity ratios include the current ratio and the acid test or quick ratio. The current ratio and quick ratio are also referred to as solvency ratios. Working capital is an important indicator of liquidity or solvency, even though it is not technically a ratio. Liquidity ratios sometimes include the accounts receivable turnover ratio and the inventory turnover ratio. These two ratios are also classified as activity ratios.