This is what happens when you have a seriously under-developed economy and then it gets unshackled: growth by leaps and bounds.
And growth always translates to low prices. This is because during growth periods, the capital structure is more efficiently allocated and thus leads to low costs of production and quality increase.
This won't last forever for various reasons I won't analyze now. But while it does, it's awesome for everyone involved. Locals get out of poverty into the middle class, country gets infrastructure and capital, importers get cheap products. So much win all-around.