DISADVANTAGES
It is simple to implement
It can be demodulated using a circuit consisting of very few components
AM receivers are very cheap as no specialised components are needed.
An amplitude modulation signal is not efficient in terms of its power usage
It is not efficient in terms of its use of bandwidth, requiring a bandwidth equal to twice that of the highest audio frequency
An amplitude modulation signal is prone to high levels of noise because most noise is amplitude based and obviously AM detectors are sensitive to it.