Inflation, their economy which was reliant on trade with the british broke down when they left. Soon there wa a mass immagration away, since they needed new jobs that the british took away.
Song dynasty is the answer
Buying the computer now will allow me to benefit from using it immediately
Buying the computer later will save me money.
Buying the computer now will work with my budget, so long as I pay more than the minimum payment.
This is the check list