Source: Image of average total cost curve, creative commons, http://en.wikipedia.org/wiki/File:Costcurve_-_Av_Total_Cost.svg Image of long run average cost curve, creative commons, http://en.wikipedia.org/wiki/File:Costcurve_-_Long-Run_Av_Cost.svg All graphs with long and short-run cost curves together, and constant scale graph by Justin Tapp
An increase of operational facilities that create an increase in marginal cost.
An increase of operational facilities that create a decrease in marginal cost.