<span>Substitution Effect, The idea that as prices rise (or incomes decrease) consumers will replace more expensive items with less costly alternatives</span>
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That is uncle sam :)) hope this helps
In my opinion no it is not necessary to do people there doing a good job. But it does make the other person feel better . But you cannot give a person to much glory for then they will only strive to hear good feed back and not be use to hearing constructive negative comments .
