Talk:Shopping/@comment-203.106.149.221-20130520051901/@comment-202.188.45.98-20130911171033

Only Caxton and Madeleine have a chance to expand their stock afaik, and both are triggered at roughly the same time although separately (i.e. you have to visit each of them since they only trigger their own quest). These two quests are the reason behind the whole idol thing, see the discussion in the Gold Idol article's comment section. You also need to sleep/let time pass and exit-reenter the city to allow the changes to take hold.