I'm a student and I want to determine the demand for a product (and consequently determine what will happen if the price of the product increases). I don't have access to any businesses that can provide the data for me (price and demand at that price?
How do I estimate the demand curve or function by surveying people? What I currently have in mind is to ask people what amount of the product they'll demand at a given price and extrapolate this data for a city or a region.
Additionally, what'd be a good sample size for such a survey?