“Judge the value of what you have by what you had to gi...

The principle of an opportunity cost does not at first glance seem hard to understand. If you spend half an hour noodling around on Twitter, when you would otherwise have been reading a book, the lost book-reading time is the opportunity cost of the tweeting. If you decide to buy a fancy belt for £100 instead of a cheaper one for £20, the opportunity cost is the £80 shirt you could otherwise have bought. Everything has a cost: whatever you were going to do instead, but couldn’t. [...] ...

 Debt Makes College a Risky Investment

Our findings, especially those that examine household decision-making, emphasize that while the return to higher education is high, it is not a safe investment for many households. The deterrent effect of risk survives the ability of agents to feasibly debt finance college with student loans. The main force here is that debt makes higher education riskier for student borrowers, suggesting that alternatives that are mindful of risk may be more effective. In turn, the focus of the policy experi...

 Knowledge Grows Faster Than Compound Interest

Remember that accumulated knowledge, like accumulated capital, increases at compound interest: but it differs from the accumulation of capital in this; that the increase of knowledge produces a more rapid rate of progress, whilst the accumulation of capital leads to a lower rate of interest. Capital thus checks its own accumulation: knowledge thus accelerates its own advance. Each generation, therefore, to deserve comparison with its predecessor, is bound to add much more largely to the commo...

 Knowledge Produces More Rapid Rate of Progress

Remember that accumulated knowledge, like accumulated capital, increases at compound interest: but it differs from the accumulation of capital in this; that the increase of knowledge produces a more rapid rate of progress, whilst the accumulation of capital leads to a lower rate of interest. Capital thus checks its own accumulation: knowledge thus accelerates its own advance. Each generation, therefore, to deserve comparison with its predecessor, is bound to add much more largely to the commo...