When a situation arises when an internal customer has a need that comes up suddenly, which is not planned for and for which there is no pre existing supplier identified to provide the product or service required, purchasing should use a/an approach.

Spot Buying

Explanation:

Spot purchases are generally completely unplanned, like being able to cope with equipment malfunction or stocking on items that  have run out and might affect organizational or individual efficiency.

In most cases,  this could be a result of bad preparation or merely unpredictable or  inevitable conditions.

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