"With the upsurge in fentanyl use, the demand for Mexican heroin has fallen sharply, by an estimated 7 billion pesos ($364 million dollars)"
Wilson Center:
The authors estimate that the opium economy channeled around 19 billion pesos ($1 billion dollars) to some of the poorest communities in Mexico in 2017. This is a vast amount, nearly three times the total legal agricultural output of the entire state of Guerrero.
...
These losses have caused farmers’ profits to disappear, village economies to dry up; and out-migration to increase.
For more, a
recent NBC report.