It’s an insulating layer that is formed amongst nerves such as nerves in the brain or spiral cord and it’s made of fatty substances and protein it allows eletric impulses to be transmitted swiftly
It acts an insulator on the neurons. The neurons are covered with it and hence the nerve impulses have to jump over the myelin sheath to reach other neurons. This causes nerve impulses to move rapidly from neuron to neuron.
The principal reason for the economic boom in the United States after the Second World War was a shortage of consumer goods combined with a reserve of purchasing power in the form of accumulated savings.