Barriers to trade within India, Canada, South Africa

Good story about trade barriers within India:

At the Walayar checkpoint in southern India, lines of idle trucks stretch as far as the eye can see in both directions along the tree-lined interstate highway, waiting for clearance from tax inspectors that can take days to complete.

Canada has the same problem:

(Canada, by the way, also has this problem. It’s often cheaper for a Canadian firm to ship to the US than to another province in Canada. You can find similar problems in Southern Africa where it is cheaper for South Africa to import produce from South America than from Zambia, as this excellent video discusses.)