Final answer:
When receiving a large order, it is important to show gratitude and appreciation. Thanking the prospect and celebrating with them fosters a positive relationship and increases the likelihood of future business opportunities.
Step-by-step explanation:
When you receive a large order after putting in a lot of effort during a sales engagement, it's important to show appreciation and gratitude. Acting nonchalant or declining the order would be unprofessional and could jeopardize future business opportunities. Instead, you should thank the prospect and celebrate with them to foster a positive relationship. This shows your enthusiasm for their business and increases the likelihood of repeat orders in the future.