The cash that was always there: the origin story of working capital as a funding source

For most of the twentieth century, working capitalworking capitalWorking capital is the difference between a company's current assets and current liabilities, measuring short-term liquidity and the funds available to run daily operations.View full definition → was treated as a cost of doing business, a necessary friction between production and payment. Inventory sat in warehouses because it had to. Receivables aged because customers needed time. Payables were settled on whatever terms the supplier had enough leverage to enforce. Nobody was optimising this pool of capital in any systematic way, because nobody had framed it as a pool of capital at all.

The mental model was simple and wrong: working capital was operational, not financial. It belonged to the plant manager and the sales director, not the CFO. The treasury function, where it existed in any formal sense, looked after borrowing and foreign exchange. What happened between invoice and payment was someone else's problem.

This framing had real consequences. Companies routinely borrowed from banks to fund day-to-day operations while simultaneously extending generous payment terms to customers and sitting on months of raw material inventory. The cash was there, technically. It just was not visible as cash.

The turning point

The shift began, imprecisely, somewhere in the 1970s and accelerated sharply in the 1980s. Two forces converged. The first was the rise of shareholder value as the organising principle of corporate management. Analysts began scrutinising return on capital employed, and companies with bloated balance sheets started to look expensive in ways they had not before. Inventory and receivables were no longer neutral. They were capital consuming returns.

The second force was more operational: Japanese manufacturing philosophy, particularly the Toyota Production System, was making its way into Western industrial thinking. The just-in-time principle was not originally a treasury idea. It was an engineering idea, a response to the constraints of the Japanese post-war economy, where warehouse space was scarce and capital was tight. But its implications for the balance sheet were radical. Holding less inventory did not just reduce storage costs. It released cash.

General Electric under Jack Welch is often cited as an early champion of working capital discipline, though the record on precise dates and specific initiatives is mixed. What is better documented is that by the early 1990s, GE Capital was actively measuring and managing working capital across GE's industrial businesses as a financial metric in its own right, not just as an operational byproduct. This was genuinely new.

Around the same time, consulting firms began publishing frameworks that tied working capital metrics, days sales outstanding, days inventory outstanding, days payable outstanding, into a single number: the cash conversion cycle. The CCC gave finance teams a single, comparable figure for how many days of cash were tied up in operations. It became possible to benchmark, to set targets, and, critically, to hold operational managers accountable for a metric that had balance sheet consequences.

The idea that a company could self-fund growth by shortening its cash conversion cycle, rather than borrowing, became thinkable once the CCC existed as a metric. Before that, the connection between operational decisions and treasury outcomes was too diffuse to manage.

From there to now

The 1990s and early 2000s brought technology into the picture. ERP systems, SAP in particular, made it possible to see working capital positions across multiple entities and geographies in something approaching real time. Before that, consolidating receivables data across a large multinational was a quarterly exercise at best. When you can only see the data every three months, you cannot manage the underlying cash dynamically.

The next layer was supply chain finance, which emerged as a structured product in the late 1990s and became mainstream in the 2000s. The logic was an extension of the working capital insight: a buyer's strong credit rating was an asset that could be monetised to help suppliers get paid earlier, at lower financing cost, while the buyer extended its own payment terms. This was working capital optimisation turned into a financial product. Programmes at large retailers and automotive companies showed that the CCC could be managed not just within a company but across an entire supply chain.

By the 2010s, dynamic discounting platforms entered the market, offering suppliers the option to accept early payment in exchange for a discount, funded from the buyer's own excess cash rather than a bank. The buyer earned a return on idle cash. The supplier improved liquidity. The working capital pool had become a two-sided market.

Today in 2026, real-time treasury management systems and embedded finance tools allow some multinationals to manage their working capital position on an almost daily basis. The gap between operational cash flow and treasury visibility, which was the core problem in 1960, has narrowed dramatically, though it has not disappeared.

Why it still matters

The origin story matters because the conceptual breakthrough, that working capital is capital, not just operations, is still not universally absorbed. McKinsey research (independent) has repeatedly found that median large-cap companies hold working capital equivalent to 15 to 20 percent of revenue, and that best-in-class peers in the same industries operate at half that level. The gap is not technology or geography. It tends to be governance: who owns the metric, who is measured on it, and whether the CFO has real influence over commercial terms that drive DSO and DIO.

The companies that treat the CCC as a treasury metric managed by the finance function consistently outperform those that leave it to procurement and sales. The insight that came out of Japanese manufacturing floors and shareholder value economics in the 1980s has not been superseded. It has just been unevenly adopted.

A CFO who inherits a company with a cash conversion cycle ten days longer than its closest competitor should read that gap as a balance sheet liability that existing operations are already funding, invisibly. Closing it does not require new capital. It requires seeing what is already there.