The Gold Pool (1961-1968) was one of the most ambitious cases of central bank cooperation in history. Major central banks pooled interventions-sharing profits and losses-to stabilize the dollar price of gold. Why did it collapse? From at least 1964, the fate of the Pool was in fact tied to sterling, the first line of defense for the dollar. Sterling's unsuccessful devaluation in November 1967 spurred speculation and massive losses for the Pool. Contagion occurred because US policies were inflationary and insufficiently credible as well. The demise of the Pool provides a striking example of contagion between reserve currencies.

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The Gold Pool was probably the most ambitious case of central bank cooperation in history. Major central banks pooled interventions to stabilize the dollar price of gold. Why did it collapse? From at least 1964, the fate of the Pool was, in fact, tied to sterling, the first line of defense for the dollar. Sterling’s devaluation in November 1967 eventually spurred speculation and unbearable losses for the Pool. Inflationary U.S. policies were weakening confidence in the dollar. The demise of the Pool provides a striking example of contagion between reserve currencies and the limits of central bank cooperation.

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In June 2018, the People’s Bank of China (PBoC) decided to include green financial bonds into the pool of assets eligible as collateral for its Medium Term Lending Facility. We measure the impact of the policy on the yield spread between green and non-green bonds, or greenium. Using a difference-in-differences approach to compare pairs of green and non-green bonds issued by the same institutions, we show that the policy increased the greenium by 46 basis points. This experience can be useful to other central banks considering similar polices.