choice-metrics.com

Hi all,
I'm quite new to choice experiments, that's the reason for my question.
I am designing a choice experiment, and my idea is to include 3 alternatives (one is the status quo) in each choice task.
I was thinking if it make sense to do in this way: one alternative is the status quo, one alternative, fixed among all respondents, in which all attributes' levels are equal to 0 (including payment, this alternative refer to no-existence of the public good), and one alternative with varying levels of attributes. Does the inclusion of the second fixed alternative make sense?
Thank you

It is unusual, but it is possible and the model parameters can be estimated. For example, in Ngene syntax it could be something like the following:
As long as people are trading off between the status quo and fixed alternative, then I think it makes sense. If the status quo is better/worse than the fixed alternative, then it does not make sense as one of the alternatives is dominated by the other.

Michiel