Answer Posted / cmkashifabrar

Suppose I want to improve performance of my washing machine.
Ways I might do this fall into three categories:

1. Supply missing inputs. It needs water, soap, and
electricity. If any one of them is missing, I can greatly
improve performance by adding it — by plugging the machine
in, for example. These changes are easy because water, soap,
and electricity are easy to get.

2. Replace broken parts. This will also greatly improve
performance. These changes are very difficult unless I am a
washing machine repairman.

3. Everything else. To improve performance any other way
will be difficult and any improvements will be small. These
other methods of improvement — such as putting special disks
into the wash — are also likely to be dangerous.

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