1. There situation are:
a. When you expect the delivery personnel will take longer than you taking a self service. So, the motivation here is time saved.
b. When you do not trust the delivery personnel, you would prefer self service. The motivation here is the lack of trust in the deliver personnel.
c. When you expect that self service will be cheaper than delivery since the delivery by the delivery personnel will include a charge. Here, the motivation is money being saved.
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