in this crazy world, where we are brainwashed to consume, and not to build

Even so much so that people are motivated to take loans for their fashion. That consumerism habit is mainstreamed through heavy advertisement, and socially through status symbol.

The basics of Economy is how much you save, that is your strength.

at home, try to consume only what we need

Yes, the earth has enough resources to fulfill the needs of everyone, not desire.

Also, to not waste too much time

Waste always has a tertiary burden in terms of its disposal management. So effort should be made to lower it and adopt simplistic life, circular economy model.