In fact, the prices of these different capacities are different. For example, the price of a small cup is the cheapest, and the price of a large cup is much higher. In fact, the three intermediate prices also need to differ by a few yuan. In general, if we drink less, we will choose a small cup in particular. However, if we drink too much at one time, we will especially choose a large cup of milk tea. Almost no one will choose a medium cup, thinking that buying a medium cup is not cost-effective, and a large cup is more cost-effective.

In the same shop, cups with different capacities were specially selected, so he first poured water into the middle cup, and when the middle cup was full, it could also measure the capacity. The water capacity of the medium cup is 500 ml, so he fills the large cup, and the measured water capacity is 670 ml, which means that there is a price difference of 170 ml between the medium cup and the large cup, but the price difference is two yuan, so it is really more cost-effective to buy a large cup.

When consumers switch from buying small cups to buying large ones, consumers and stores achieve a win-win situation. For the store, the increase from small cup to large cup only needs to increase part of the cost (obviously lower than the difference between large cup and small cup), thus bringing more profits to the store. For consumers, consumers can enjoy more discounts because the store is willing to provide more discount space for large cups.

The packaging of these drinks is actually very tricky. After all, the money is added, so there will be more drinks, but the gap is not obvious. However, most of these drinks are sealed. Sometimes this quantity is more or less decided by the store, so it is easy to fill a large cup with a medium cup. Keep your eyes open when you drink next time.