Collateral Channel

Overview

The collateral channel describes how the market value of an asset pledged as loan security determines a borrower's capacity to obtain credit, and how changes in that value can amplify swings in the wider economy. The mechanism was formalized by Nobuhiro Kiyotaki and John Moore in "Credit Cycles" (Journal of Political Economy, 1997): when collateral values rise, borrowers can borrow more, which can push spending and the price of the collateral asset up further; when values fall, the same feedback runs in reverse, forcing deleveraging.[1]

Land and real estate play an outsized role in the collateral channel because they are durable and do not depreciate the way most physical capital does, making them a preferred form of bank collateral. Ryan-Collins, Lloyd & Macfarlane's Rethinking the Economics of Land and Housing describes a self-reinforcing "house price–credit feedback cycle": mortgage lending pushes up land prices, higher prices support larger loans against the same land, and the resulting credit expansion pushes prices up again — a cycle typically broken only by a shock or an interest-rate rise (Ch. 5, §5.1). The authors note that mortgage lending's share of bank balance sheets roughly doubled across 17 advanced economies over the course of the twentieth century, and that including commercial property, land-related lending reached roughly 80% of GDP at the 2008 crisis peak (Ch. 5, §5.2).[2]

Georgist Significance

Because land supply is fixed, Georgists argue the collateral channel is disproportionately a land-credit phenomenon rather than a generic feature of asset-backed lending: rising land values expand banks' collective willingness to lend against land, which can further bid up land prices — a dynamic tied to the 18-year land cycle and cited as evidence that the growth of modern banking is largely mortgage credit against land. A land value tax, by suppressing the untaxed capital-gain component of land prices, would directly shrink the collateral value the channel runs on — the mechanism Georgists point to as the source of the tax's claimed stabilizing effect on credit cycles.

See Also

• Finance's growth is largely mortgage credit against land — the empirical case that bank credit expansion is mostly land-collateralized lending
• The 18-Year Land Cycle — the cycle this feedback loop is argued to drive
• Land Value Tax — the policy Georgists argue would dampen the channel at its source
• Objection: cycles are driven by credit, not land — the credit-school framing this concept partly bridges

Sources

1. "Kiyotaki–Moore model," Wikipedia — used for the formalization of the collateral-channel/credit-cycle mechanism (Kiyotaki & Moore, "Credit Cycles," Journal of Political Economy 105(2), 1997) and its account of collateral-value feedback on borrowing capacity. Wikipedia
2. Josh Ryan-Collins, Toby Lloyd & Laurie Macfarlane (2017), Rethinking the Economics of Land and Housing, Ch. 5 — used for the house price–credit feedback cycle, the mortgage-lending share doubling across 17 advanced economies, and the ~80%-of-GDP land-related lending figure at the 2008 crisis peak. wiki summary