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Current ratio, quick ratio, and cash conversion
A profitable company can go bankrupt. The phrase sounds paradoxical, but it happens regularly — usually because the company couldn't pay bills when they were due. Profitable on paper, broke in cash. Liquidity analysis is the discipline of asking, before you invest, whether the company can cover its short-term obligations. The math is simple, and the gap between investors who do this work and those who don't is unforgiving.
= Current Assets − Current Liabilities. It's the cushion the business has to absorb a slow customer-payment month, an unexpected expense, a sudden inventory build. Most healthy businesses run positive working capital. The exceptions — Amazon, Walmart, Costco — are powerful enough to collect cash from customers BEFORE paying suppliers, effectively getting free financing from their supplier base. That's a sign of pricing and bargaining power, not a flag.
= Current Assets ÷ Current Liabilities. Above ~2.0 is comfortable. Below ~1.0 is a flag (sometimes appropriate, often not). The (acid test) is the more conservative version: (Cash + Short-Term Investments + Accounts Receivable) ÷ Current Liabilities. It strips out inventory because inventory may be obsolete, slow to sell, or worth less than book in a fire-sale scenario. A quick ratio below 0.5 is usually a serious liquidity flag.
The interpretation is industry-dependent. Software companies often run quick ratios well above 1.0 because they collect subscription cash upfront and have no inventory. Retailers and grocers run quick ratios near 0.2-0.4 because most of their current assets are inventory; they're not in trouble — they just turn inventory fast and pay suppliers slowly. Apple's current ratio is around 1.0 not because Apple is in trouble but because Apple chooses to keep less idle cash on the operating balance sheet (it holds large investments separately) and uses its scale with suppliers to extend payment terms. The combination of strong operating cash flow plus supplier leverage means the headline current ratio understates Apple's liquidity.
= DIO + DSO − DPO. Days Inventory Outstanding (how long inventory sits before being sold). Days Sales Outstanding (how long until customers pay after a sale). Days Payable Outstanding (how long until the company pays its suppliers). The cycle measures how many days of operating capital the business needs to fund itself between paying for goods and being paid for them. Apple's cycle has historically run NEGATIVE — they get paid by retailers before they have to pay their suppliers. Negative cash conversion cycles are a sign of structural bargaining power and one of the underrated value-creation mechanisms in modern corporate finance.
Several of the most powerful businesses in the world deliberately run NEGATIVE working capital, meaning their current liabilities exceed their current assets. This isn't a sign of distress — it's a sign of bargaining power. Apple collects cash from app stores, retailers, and consumers within days of a sale, while paying suppliers on net-90 to net-120 terms. Walmart receives cash from customers at the register and pays suppliers two months later. Costco's membership-fee model collects upfront, with inventory turnover in 30 days and supplier payments stretched. The structural result: each new dollar of revenue generates working capital RELEASE rather than working capital absorption. The company gets a small loan from its supplier base every time it grows. For an investor, negative working capital with strong operating cash flow is a quality signal — it usually means a dominant competitive position vs. suppliers and customers. Source: company 10-K filings, FY2024.
The Ratios tab computes current ratio, quick ratio, cash ratio, and cash conversion cycle automatically and plots them over 10 years. The KPIs tab graphs days inventory, days sales outstanding, and days payable outstanding so you can see the trend in each component of the cycle. The Financial Statements tab shows the underlying current assets and current liabilities line items if you want to do the math yourself. A useful peer-comparison: a current ratio of 0.8 looks alarming until you see that all five competitors run at 0.7-0.9 because the industry's working capital structure is just like that.
Treating ratios as universal thresholds rather than industry-relative measures. A current ratio of 1.2 is alarming for a software company (where it should be 2-3) but normal for a grocery chain (where it's typical). A quick ratio of 0.8 is comfortable for a SaaS firm but worrying for a manufacturer. Walmart's persistently 'low' current ratio doesn't make Walmart unhealthy; it makes Walmart Walmart. The right comparison is always to industry peers, not to a textbook number. The other trap: high ratios aren't always good. A current ratio above 4 might indicate the company is hoarding idle cash that could be returned to shareholders or invested productively. Buffett's 1986 letter made this point — capital sitting idle has an opportunity cost. Liquidity is a means, not an end.
We try to find businesses that, in our judgment, can earn high rates of return on capital and where the cash generated from the business is unlikely to be needed for capital expenditures. The combination — high returns, low reinvestment requirements — is the engine that produces large amounts of distributable cash year after year, decade after decade.