Lets check that calculator again, if pakistan sell 10 kg mangoes for 100 /kilo, india can deliver 20 kilo of the same at 50/kilo, plus transport, dont u know the 2.5 times wholesale price formula. there goes the pakistani heart of asia advantage. Iran exports $800m to afghans every year, afghans can easily balance it using the Chabahar-Zahedan railway line that india is building, Iran growing at 8% is good chance for afghans. Chahabar gives access to african market to afghans(including afghan taliban who are irans friend), india will obviously help them with the shipping, the international north south corridor in progress will connect afghans to europe through chahabar which can handle 100,000 tons cargo ships.