Why is it needed?
So as not to overload the brain. The body's resources are limited. Each of us has a certain reserve of mental strength (as well as physical). When we make decisions, these forces are spent. The more decisions we make during the day, the more difficult it is to make a decision in the evening. Our brain, like the processor of a smartphone, heats up and discharges the battery when the load increases.

To be more attentive. Our attention is also limited. We can only keep a few objects in focus. Scientists say that from three to seven, but a lot depends on the person, and even more on the objects themselves. Keeping five two-digit numbers in focus is easier than five four-digit ones.

To save money. Saving is the result of free attention and unspent cognitive resources.

To save time. With a shopping list we

- don't waste time on hundreds of memory accesses;

- we don't waste time making dozens of decisions;

- we don't waste time going around the whole store and looking at every shelf.