Supply and demand only creates higher wages if the business can support the extra costs and the workforce has the bargaining power to exploit the situation. Other wise you get slightly more wage for a few years and then the company goes broke and wages fall substantially below what was before. What we have seen in Aviation is that as wages get higher, the smaller operators just disappear rather than pay better, with of course a few larger organisations hanging on due to better management. Companies try to offset the higher costs by employing fewer reserves and using callouts to patch gaps. The callouts still cost less than another full crew set even when its weeks worth, so make sure you are getting rewarded well for your casual work. Also casual work and overtime makes it seem like you are earning more, but you have gained no increase in base salary, which means when it all returns to normal the company has not increased its fixed costs.