Because it envelopes the Short Run Cost curves.
Long run average cost curve is known as envelope curve because it is formed by enveloping the short run average cost curves and it helps the entrepreneur in long term planning that is why it is also called planning curve.
The circuit that generates signal having the shape like imaginary curve is called an envelope detector. The effect of the time constant RC in envelope detector is that the output follows the input curve and the circuit performs like a demodulator.
of course that LRAC envelope various SRAC. of course that LRAC envelope various SRAC.
average products is highest
In long run non of the factors are fixed,long run average cost is the locus of envelope point of various SATC's. The operation of law of returns to scale is major reason for the U shaped of LAC.
lac
In the UK it's called a: Stamped, Addressed Envelope
LCO
Ess curve
"A lake" is "un lac" in French.
its an operon required for the transport and metabolism of lactose.
The liquid curve is called a meniscus.