A supply manager is tasked with assisting internal customers in refining their budgets and planning...

A supply manager is tasked with assisting internal customers in refining their budgets and planning future sourcing. The supply manager works with the firm's marketing director on a budget which includes a large direct mail campaign and the revision of promotional materials for several products.

Six months later, marketing has nearly exhausted the budget due to cost increases in paper and printing, even though the marketing campaign's scope has not changed. Which of the following did the supply manager and marketing director fail to consider?