The customer wants you to commit. When you say "let's do a week at a time", the customer does a mental calculation of what one week of your time is worth if the project doesn't complete, arrives at the number $0, and responds accordingly.
That doesn't mean you work a fixed-price gig. It does mean that you give serious thought to a conservative estimate of the whole gig and then confidently offer that as your price for the engagement.
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The customer wants you to commit. When you say "let's do a week at a time", the customer does a mental calculation of what one week of your time is worth if the project doesn't complete, arrives at the number $0, and responds accordingly.
That doesn't mean you work a fixed-price gig. It does mean that you give serious thought to a conservative estimate of the whole gig and then confidently offer that as your price for the engagement.