In which of the following cases is money being used as a medium of exchange?

you pay your neighbor $10 for clearing the snow from your driveway with his snowblower.
your grandfather gives you $100 for your birthday and you put the money into a savings account.
a plumber raises his hourly rate from $70 per hour to $80 per hour.
a farmer buys seed to plant his crops.
a wealthy alumna donates $1 million to her alma mater.

Take deep breaths and try to calm yourself down

The advantage of administering personality tests on employees is that it will allow the employer to know the mindset and personality of the employee. this will allow the employer to at least have an idea as to how the employee works and how his attitude in the workplace. the disadvantage is that it may make the employee a little anxious as to whether he would meet the personality requirements of the employer and whether he would be able to retain the job or not.