The Bank-Financed Margin of Trade Credit: Evidence from Italian Innovative and Ordinary SMEs
This paper reconciles conflicting literature on the relationship between bank and trade credit by demonstrating that bank indebtedness is complementary to the credit firms extend to customers but substitutive for the credit they receive, a duality explained by a unified theoretical model and revealed through a comprehensive analysis of Italian SMEs that highlights how measurement scaling choices can obscure these distinct margins.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
In the world of small business, money rarely moves in a straight line. When a company sells goods or services, it often does not get paid immediately. Instead, it extends credit, allowing the customer to pay later. This is known as trade credit, and it acts as a temporary loan from the seller to the buyer. At the same time, that same seller often needs to borrow money from a bank to keep its own lights on and its shelves stocked. For decades, economists have debated a simple but crucial question: when a business gets more money from a bank, does it lend less to its customers, or does it lend more? The prevailing theory suggested a trade-off, a zero-sum game where bank loans and customer credit were rivals. If a bank tightened its grip, the theory went, businesses would be forced to lend more of their own money to keep sales flowing, effectively substituting one source of funding for another.
A team of researchers from Italy set out to test this long-held belief by looking at the actual financial records of nearly ten thousand small and medium-sized enterprises over a ten-year period. They examined a specific group of companies, including innovative start-ups and established ordinary businesses, to see how their borrowing habits from banks influenced the credit they granted to their own customers. The researchers did not just look at the numbers; they built a new way of measuring the relationship that avoided common mathematical traps that had confused previous studies. They wanted to know if the two types of credit were enemies or partners.
The answer they found turned the old theory on its head. Instead of fighting each other, bank loans and customer credit moved in the same direction. When a company increased its debt to the bank, it also extended more credit to its customers. The data showed a clear, positive link: for every percentage point a firm increased its bank debt relative to its sales, the time it waited to collect money from customers grew by roughly half a day. This means that businesses were not cutting back on customer loans when they borrowed from banks; they were actually using the bank money to fund those customer loans. The researchers described this as a redistribution of funds, where the bank acts as the primary source of capital, and the business acts as a middleman, passing that capital down the supply chain to customers who cannot borrow directly.
This finding challenges the idea that businesses only lend to customers when banks refuse to lend to them. The study showed that the opposite is true for the companies they examined. When a business has access to cheap bank credit, it feels more secure and is willing to offer longer payment terms to its clients. This behavior is most pronounced in companies that operate on long cycles, where it takes a long time to turn inventory into cash. For these firms, bank credit is the lifeblood that allows them to keep the supply chain moving. However, the effect is not uniform. In companies that are already rich in cash or those that are losing money, the connection between bank loans and customer credit weakens or disappears entirely. The researchers found that the relationship is strongest where the need for funding is most urgent and the commercial cycle is longest.
The researchers also discovered that previous studies may have reached conflicting conclusions simply because of how they measured the data. Many earlier papers compared ratios that shared the same denominator, such as dividing both bank debt and customer credit by total sales. This mathematical setup can create an illusion of a relationship that isn't really there, or even flip the sign of the result from positive to negative. By using a different method that did not rely on these shared ratios, the team confirmed that the positive link is real. They tested their findings using advanced computer models to ensure that the relationship was not a fluke or a result of hidden variables. These models, which can detect complex, non-linear patterns, agreed with the simpler statistical approach, confirming that the connection is straightforward and additive.
The implications of this discovery are significant for how governments and banks think about economic policy. If businesses use bank loans to fund their customer credit, then policies that restrict bank lending will not just hurt the borrowing company; they will ripple down the supply chain, forcing businesses to tighten credit for their own customers. This could slow down the entire economy, particularly for smaller firms that rely on these extended payment terms to survive. Conversely, making bank credit more available could have a positive multiplier effect, allowing businesses to lend more freely to their customers. The study suggests that the health of the banking sector is directly tied to the liquidity of the entire supply chain, with the most vulnerable firms feeling the impact most acutely.
The research covered a decade of economic activity in Italy, a period that included both tightening and loosening of credit conditions. The strength of the connection between bank loans and customer credit changed over time, weakening as bank credit became more abundant and cheaper. This pattern fits the theory that businesses only need to pass bank money down the chain when they are constrained. When money is plentiful, the pressure to redistribute it lessens. The study also looked at different types of companies, including those certified as innovative start-ups. These firms, which often have special access to public guarantees for bank loans, showed a strong tendency to pass that support along to their customers, suggesting that government-backed credit schemes have benefits that extend far beyond the companies that directly receive them.
Ultimately, the paper paints a picture of a financial ecosystem where credit flows from banks to businesses and then to customers in a continuous stream, rather than as a choice between two separate paths. The old view of substitution, where one credit source replaces another, does not hold up under this closer scrutiny. Instead, the evidence points to a system of complementarity, where access to bank finance enables businesses to be more generous with their customers. This dynamic is not a universal law for every single company, but it is the dominant pattern for the vast majority of the small and medium-sized enterprises studied. The researchers conclude that understanding this flow is essential for anyone trying to manage or regulate the economy, as the health of the banking system and the flow of trade credit are inextricably linked.
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