Refuse is a serious issue in any society, about as serious as cleaning the water and air, even more so to some degree, especially if you study your history with regards to the plague. This is why it is considered one of the better long-term hold stocks to have in one’s portfolio. Today people are living much longer generally due to cleaner living environments, proper trash disposal, sewer treatment plants and a relatively clean civilization.
When building owners cut costs to keep their investments you have a considerable risk when you lengthen the time between trash intervals, even worse when the garbage companies cut corners or in one case an Environmental Company which is Canadian Based allowed untreated chemicals into where they should not be. Cutting corners to save money. But when it is this serious why is it done? Well for one people want something for nothing. Part of this reasoning of these companies is the stock gambler wanting exponential growth and demanding returns that do not exist under current thinking in a matured market such as trash and refuse in economic downturn. It was always considered a safe industry no matter what the economy was doing, yes it is safer than most, but not so safe as to be unaffected in economic recession.
No matter how much you improve the efficiencies there is a diminishing return available, just like in manufacturing and Finite Capacity Scheduling models for workflow. When any company stays within a finite arena where there is little or no innovation in such a maturing market you run out of places to sell your wears. Think about it.