Interdependence help? 10 points for best answer!!?

these business's are interdependent because the secondary sector may rely on banks to give them a loan so they can get money to carry on building. If there had been an earthquake the building companys would certainly rely on the banks ! also the insurance company will be relied on to insure the buildings at a good price, if the buildings cannot get insurance because of the earthquake driving up prices then none of it will work