according to the article. So Nicaragua although substantially poorer than Venezuela apparently can produce enough food for itself while Ven cannot. Sounds like a failed economic system in Ven to me, or the black bean hoarders.

I can't figure why it happens.

There are leftists leaders who have done great things with their economies such as Ecuador and Nicaragua. The problems in Venezuela and Argentina seem to me to be much more a product of corruption than "leftism"

and has had leftists in power in Garcia and now Humala.

Venezuela and Argentina are examples of how NOT to run a country left, right, center, any type. Not sure why you included Nicaragua which is still the poorest country in the region I think. They have been aided by the FTA with the US and likely with exports to Venezuela and had decent growth but not anywhere near the gains of other countries in the region lately.

I agree it is poor, but they seem to be doing the right things and it seems to be reasonably well Governed. I was there last year and was very impressed. But perhaps you are right that it is not a good example.