…are things that happen now and have a deleterious impact later on.
The simplest example is a train delay. Because all trains run on the same tracks, a delay in one trains delays the next few.
A more personal example may be any one of your bad habits. Perhaps you smoke. One cigarette won’t kill you now but the accumulation increases all likeliness of getting cancer.
There’s nothing positive within a knock-on effect other than what it predictably teaches, that bad things can be prevented with careful planning.
You’re unable to prevent a train delay but you can save your health. You’re current investment is always one for the future.