"Why Exchange Rate Bands
? Monetary Independence In Spite of Fixed Exchange Rates." Journal of Monetary Economics, 33, 1994, 157-99.
Starting in November 1991, when inflation was running at 20% in annual terms, Mexico adopted a system of gradually widening exchange rate bands
aimed at giving the central bank scope to strike a better balance between the "credibility" and "flexibility" of its monetary regime (Helpman et al., 1994).
To allow greater policy flexibility, the Mexican central bank began to use exchange rate bands
instead of a fixed exchange rate in late 1991.
The Central Bank raises its interest rates by 30 basis points to 10.1 per cent and announces that it has widened the exchange rate bands
from 6 per cent to 9 per cent.
The most plausible solution to this problem seems to be crawling exchange rate bands
. As a dynamic version of exchange rate pegging, these had become popular during the 1980s and 1990s in moderate-inflation middle-income countries such as Chile, Colombia, Israel, and Mexico, as well as in some transition countries such as Hungary, Poland, and Russia.
Dominguez and Kenen  present ample evidence, however, that central banks mainly defend exchange rate bands
by intramarginal "leaning-against-the-wind" interventions, so as to keep the exchange rate well away from the edges.
'Why Exchange Rate Bands
? Monetary Independence in Spite of Fixed Exchange Rates', Journal of Monetary Economics, 33, 157-99.
Practical inflation targeting has several common characteristics: 1) an announced quantitative inflation target, varying across countries between 1.5 and 2.5 percent per year, in most countries with a tolerance band of plus/minus 1 percentage point around the target; 2) no explicit rule on how the central bank shall set its instrument; 3) a floating exchange rate (except for Finland and Spain, which are members of the Exchange Rate Mechanism, although the wide exchange rate bands
there so far have not created any conflict between the inflation target and the exchange rate target); and 4) a high degree of transparency and accountability.
(1994), `A New Breed of Exchange Rate Bands
: Chile, Israel and Mexico', Economic Policy.
The short-term response to the widening of the exchange rate bands
was both interesting and instructive.