This is an example of anticipatory change in the market and working accordingly.
Step-by-step explanation:
The cost of inflation int he country that Van works in have risen up directly and this increase in the rate of change of inflation has led to volatility in the market.
SO he updates the prices every day and sends newspaper inserts advertising the new prices. This makes it better for him to deal with the inflation that is happening and fluctuating everyday.
This makes the functioning smooth in context of his daily dealings with costumers who need to be aware of what is happening in the market.