Solvency ratios determine the firm's long-term financial stability and ability to meet future obligations. They include debt-equity ratio, proprietary ratio and interest coverage ratio. Liquidity ratios indicate short-term ability, activity ratios measure efficiency and profitability ratios show earnings. Long-run survival depends on the firm's capacity to repay long-term debts, which is why solvency ratios provide the most critical information for long-term operations.