You are the manager at Lafarge PLC and for the first time in a number of years, you decide to raise prices of the Mphamvu brand cement by 2 percent. If, as a result of this price increase, the volume of Mphamvu cement sold by Lafarge dropped by 3 percent, what can you infer about the own price elasticity of demand for Lafarge's Mphamvu cement? Can you predict whether revenues on sales of Mphanvu cement increased or decreased? Explain