Final answer:
Inexpensive and inflexible transportation modes tend to perform poorly when plans change.
Step-by-step explanation:
Inexpensive and inflexible transportation modes tend to perform poorly when plans change. This is because the lack of flexibility makes it difficult for these modes of transportation to adapt to unforeseen circumstances or changes in the transportation route. Additionally, the inexpensive nature of these modes may result in lower quality or efficiency, further contributing to poor performance.