CBC - Two price models

Hi everyone,

I got a questionnaire containing a CBC from a project manager that is set up like this:
- Respondents are shown a concept and are asked, before entering the CBC, whether they would prefer to pay for it a) at a monthly rate or b) the whole price at once.

- Then the CBC is conducted with a variety of attributes, one of which is price (5 attribute levels). The levels depend on the price model preference question that was asked before the CBC exercise begins. Distances between the five price points are proportional between the monthly-rate-model and the one-time-payment model.

My question is: Do I have any disadvantages incorporating both price models in the same Conjoint analysis and just using some unverified perl to show either a monthly rate or a one-time-payment price? Or is it advisable to set up two separate conjoint exercises, one per price model?

As I understand it, this would only be called conditional pricing if the attribute "price model" would be included in the cbc itself, rather than being asked outside of the conjoint exercise?

Note: reservation prices shall be calculated during the analysis.

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