The US-Mexican border economy is supported by both U.S. and Mexican citizens and business people. There are also significant investments made in the region from businesses located primarily outside of both countries.
Currently the most significant change in the "border economy" is the significant reduction in United States tourists visiting Mexican border towns. A number of reasons for this has been cited, including the Mexican government's apparent inability to maintain desirable levels of peace and quiet and acceptable levels of violence by its citizens and residents.
Significant trade occurs on both sides of the U.S./Mexican border between the two countries.
For as long as I have been visiting the border areas of San Diego (over 25 years) I have seen large numbers of people who likely are Mexican citizens. For a long time Mexicans have crossed the border to buy goods and services not available in their resident areas (or only available at higher prices or in lower quality versions).
I maintain that the peso and dollar's value are constantly fluctuating. And it's largely been that case since Mexico stopped artificially "pegging" their currency to the dollar decades ago.
I think you show your ignorance of free markets and currency exchange when making the inane statement that no fluctuating is going on.
Many sharp business people in many different cities accept numerous foreign currencies.
Your words, not mine.
I don't understand why you keep asking about some exchange rates that existed +40 years old. Especially since those were old pesos and in Mexico it is new (nuevo) pesos in circulation today.
I know just a limited amount regarding the history of the peso.
If I recall this correctly, the Bank of Mexico and one or more Mexican government agencies tried to hold the peso exchange rate unchanged at 12.5 pesos to the dollar starting in the mid 1950's. I believe they alternately propped up the dollar and the pesos value (in comparison to the other currency) for a long time, like 20 or 22 years (until it became impractical during the last 5 or so years of that policy and they couldn't continue on that track)
Mexico is hardly the first emerging economy that tried pegging its currency's value to some other foreign country's currency. This usually causes all types of economic inefficiencies and strife as markets can best correct imbalances when currency values are free to fluctuate in free markets.
A currency like the U.S. Dollar always exchanges freely against dozens of currencies everyday and has its (RELATIVE) value rising and falling constantly.
One last comment Amigomio...
All of my educated friends would spell psychology P-S-Y-C-H-O-L-O-G-Y.
But I understand your difficulty.
It is a four syllable word.