Final answer:
It is not necessary to make all purchases from a supplier once you establish a good working relationship. Other factors like price, quality, and availability of products should be considered.
Step-by-step explanation:
No, it is not necessary to make all of your purchases from a supplier once you establish a good working relationship with them.
While a good working relationship with a supplier is important for business, it is also important to consider other factors such as price, quality, and availability of products.
For example, if another supplier offers a better price or has a wider range of products, it may be more beneficial to make purchases from them instead. It's always important to weigh the different factors before making a purchasing decision.