You indicated earlier that with the fall in energy prices there's also a commensurate fall in government revenues, naturally. However, that's offset by the fact that people will have more money in their pocket as a result of spending less on energy, therefore, they'll be spending that money on other goods and services, thereby raising government revenues on that side of the ledger.
Does the same not occur when the government relieves a tax burden on citizens too: if they have more money they're going to spend more? Would the same principle apply?