Don't worry, there will be algorithms that play the market by buying and stockpiling goods when their prices are low and sell them when their prices are high, smoothing out the supply/demand and taking a small margin in exchange for bearing that risk.

Then there will be services that virtualize that, with price insurance and the like.

Then there will be services that let you put in an order that will only buy something if its price goes below a certain level.

Then there will be services that let you put in a time-scale over which you want to buy something and make sure you get the best price while still getting the item within that time (including shipping price and time, of course).

Then there will be services that estimate all this for you.

I'm still waiting for someone to write the dystopian novel where you choose an "advertising agency" and they surveil you, automatically ordering everything you need/want based on your income, taste, preferences, etc.