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In page Economy of Mexico:

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Until 2008[citation needed],[1] Mexico used a unique system, amongst the OECD countries,[2] to control inflation in a mechanism known as the corto (lit. "shortage") a mechanism that allowed the central bank to influence market interest rates by leaving the banking system short of its daily demand for money by a predetermined amount. If the central bank wanted to push interest rates higher, it increased the corto. If it wished to lower interest rates, it decreased the corto. In April 2004, the Central Bank began setting a referential overnight interest rate as its monetary policy.[citation needed]