PPP dude, this is why PPP. It takes into account prices of local goods.You're wrong, the price of the meal would also increase because of the fall of rupee since you have to import petroleum or other sources of energy and also other commodities through $USD from the international market. You have to pay more for the imported raw materials and thus it will decrease the value addition of the GDP.
The drastic change in the figures don't reflect actual change, is what I meant. The figures look good because of change in base year. Doesn't mean economy suddenly got so much better in just one year. It just mean that economy wasn't properly being represented in figures previous years.You're fundamentally wrong, the change in base year was done to reflect more accurate picture of the economy, not to make it more impressive, previously the economic projections were underestimated, after the change in base year, they are now more accurate.
Also, Even the worst year, 2013, west Bengal economy was better than Bangladesh (per capita GDP/income, PPP/nominal). It is only getting better now. Besides, a couple of years can't change the immigration numbers drastically. People have migrated over the years, not in just one or two.