  There is a consensus today that the the main lesson of the Aharonov-Bohm
effect is that a picture of electromagnetism based on the local action of the
field strengths is not possible in quantum mechanics. Contrary to this
statement it is argued here that when the source of the electromagnetic
potential is treated in the framework of quantum theory, the Aharonov-Bohm
effect can be explained without the notion of potentials. It is explained by
local action of the field of the electron on the source of the potential. The
core of the Aharonov-Bohm effect is the same as the core of quantum
entanglement: the quantum wave function describes all systems together.
