Next she selected a parasol from a large and varied assortment in the rear of the store. Not that she had any idea what it was used for; but other ladies carried such things, so she also would have one.
Source: http://www.classicreader.com/book/2953/1/
I am not sure what "would" means in my sentence. From the context of the paragraph I undestand it that she wants to behave according to the the other ladies. So I would await the form "had to have one".