Cycles are part of life. Whether it be the cycle of day and night, seasons, tides, weather cycles from the almost weekly cycles of cold fronts that regularly blow across southeast Australia to the longer La Nina and El Nino cycles, fertility cycles, birth and death, etc. And so, cycles are also endemic to economies and investment markets. Some are regular, some just rhyme. Despite attempts to end or subdue them via economic policy and regulation the cycle lives on. Usually when we declare investment cycles dead they come back to bite us. Sometimes they bring much joy to investors but they can also bring much angst. But what are they? What causes them? And why do investors need to be aware of them?