What happens to the incentives of terror groups in response to such a policy?
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The role of money only becomes an issue when conducting a terrorist attack becomes expensive. Missiles and jets consume much more money in comparison to training recruits via an intermediary organization like LeT and sending them across the border to carry out attacks.
A regime in which a terror attack leads to a high pressure, expensive situation for the Pakistani military is completely different from regularly scheduled, train and deploy terror attacks from militants which used to happen earlier.
In that situation, the military has to respond to economic pressure, pressure from allies and pressure from its own people.