There is such a thing as negotiating too hard on price. The deliverables have lower cost to benefit than if you paid more money. Or worse no deliverables. Worse than that fatal realized liabilities.

I worked with a group that designed telcom IC's. One of our customers developed a new product. Which then failed in the field. The parent company had to issue a recall. Destroyed all remaining inventory and canceled the product. All because someone jacked the microphone supplier down about 5 cents on a part.