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How long do you think this situation will last?
How much food storage would have been enough to make it through?
Hard to answer with any accuracy...
We're talking about a country under marshal law, no reports (that I find anyway) about resistance from the general population or the military.
Without an end in sight, there is no way to calculate how much food would have be "enough". I think the only response is to grow your own food, assuming you have a place to do that.
Comparing their situation to ours (personally), we would have to bug out from this urban environment and find a place to start a garden/homestead.
Watching Venezuela, it looks like many/most people are still in a "hunker down" mode and trying to survive on government handouts. There is still money flowing in their economy, people are still driving cars (cheat gas) and there appears to be enough food moving to stores to keep people from leaving the cities in large numbers.
I do see that Venezuela has opened their border to allow food purchase, by individuals, from neighboring countries.
Curiously, I do not see a mass migration out of Venezuela. I don't know why this is not happening, or perhaps it is simply not being reported.
Again, comparing to the USA, there is no "other" country to which we might "escape". Mexico is very un-friendly to the US and Canada is not much better off than we are and is definitely a cooler climate. Within the US, some states are in better condition to accept a flood of hungry people from another state (think of the golden horde leaving California). but the routes out of those places may not be able to handle a mass exodus and other states may be unwilling to accept such a flood of new, hungry people.
It comes down to planning, now, for possible future events.