Time is not money: Thinking about it makes you a better person

Generally there is a reasonable limit on the number of billable hours you can have in a week and be productive. So once you hit that cap, for me is 45-50. Then you just don't have to put a price on the fun cause you've already maxed out your potential money for the week.

Thinking of opportunity costs in general is usually a downer in any context. It's a "could have" and wherever there is a "could have", a "should have" is not too far behind. Regret is never a good thing.

Also, a lot of people recognize that time is money, but rarely do they think that money is time. They never use their money to buy back time. Instead they use it to make more money. And now they have to spend more time protecting, managing and investing that money because if they don't, they'll feel bad about the opportunity cost of their money sitting in the bank and being eroded by inflation.

And enough people know how to earn money, but most people don't know how to spend it. When I say spend, I don't mean waste or reinvest. Consider: if you give someone X dollars, he will start by eating better food; give him 2X and he'll dress better; 3X and he'll buy a better car; 10X, a better house. This is usually where people's imagination start to fail them. 20x? Er... buy an even better car and a better house. 50x? Buy two cars and two houses. 100X? Buy a yatch. 200X? Buy a private jet.

Notice that after the lower levels of Marslow's hierarchy have been satisfied, people just don't know what to spend their money on. All they can think of is buying bigger and bigger versions of what they already have. You can't eat away a $100 million no matter how much expensive food you eat. You can't live in all the rooms of a 50-room mansion. All you can do is use your money to make more money or waste it. Not many think of spending it to buy back your time -- spend it doing something you like.

Value your friends more. Time with friends: priceless. (This applies only first X hours each week spent with each friend). After all, if you're deciding to spend your time with them even though you have such a high hourly rate, they must be very good friends. When you die, would you regret not spending enough time making money or not spending time with your friends more?

if my hourly rate were >$100, I'd be working <20 hours a week, because $2000 is enough to pay for (+ rent bills toys), and I'd have the rest of the time to do stuff I actually wanted to do.

Staring eyes 'deter' Newcastle University bike thieves [1]

Cues of being watched enhance cooperation in a real-world setting [2]

[1] http://www.bbc.co.uk/news/uk-england-tyne-22270052

[2] http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1686213/

units??

Depends on the exchange rate.