Inflation-ratio overlays, peso breaks and election cycles

A three-layer read of one shock

An editorial reading of this archive treats one FX shock as a three-layer regime problem. The first layer is the partner inflation-ratio overlay as the intermarket backdrop. The second is currency-translation of the cumulative-inflation-differential into a home-currency valuation-gap. The third asks whether a political-calendar-cycle is lining up with that stretch.

Long-term exchange-rate direction is framed with an intermarket overlay built from the ratio of two countries' inflation rates rather than from tick-by-tick FX noise.

Build the inflation-ratio overlay

The working method is to form a consumer-price-index ratio for the two economies and shift that series so it sits as a best-fit overlay on the exchange rate. If one country has persistently higher domestic inflation than another, its currency is expected to weaken against the partner when other influences are held constant, because a unit that buys less at home should also buy less abroad.

For the United States and Britain from 1900 to 1994, both the CPI-ratio overlay and the pound-dollar rate rose by a factor of about three. The longest break after World War II is described as intentional recovery policy rather than a failure of the inflation link.

Translate the gap into a peso stretch

Currency-translation reads faster domestic price growth as a loss of external purchasing power versus a lower-inflation partner. Mexico's mid-1990s peso break is treated as a case in which a widening cumulative inflation gap versus the United States had already thinned the currency's support, with the valuation-gap near a 24-year extreme before surrounding events triggered the collapse.

Near the end of 1994 the peso was described as needing official buying to hold, while the current-account deficit had reached about 7.9 percent of GDP and more pesos were leaving than hard currency was arriving. The 1994 incoming government inherited a peso described as cumulatively overvalued by about 35 percent.

A slower managed move toward about 5.5 pesos per US dollar is presented as having been visible months before the December 1994 to January 1995 panic, while a later push back to 3.5 is judged unlikely under the inflation-differential frame.

Check the political-calendar-cycle

Major peso adjustments in the illustrated history clustered on Mexico's six-year presidential transitions, including 1976 and 1982. In editorial terms, the third layer is not a prediction of any election. It is a check on whether a recurring political-calendar-cycle is coinciding with an already stretched valuation-gap.

After the first break

The break is also used to illustrate recursive-liquidation. The first currency drop prompted sales of Mexican holdings, which pushed the peso lower and induced further exits until that process exhausted itself.

An editorial synthesis keeps the layers distinct. The inflation-ratio overlay is the intermarket backdrop. Currency-translation names the valuation-gap. The political-calendar-cycle asks whether a recurring six-year transition window is lining up with that stretch. Recursive-liquidation then describes how the first drop fed further exits until the selling exhausted itself.