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How to Explain “efficient frontier” to child?
I would let them get their hands dirty, learn by practicing. Below you can find a simple program to generate your own efficient frontier, just 29 lines' python. Depending on the age, adult could help in the activity but I would not make it too lecturing. With child-parent relationship, I would make it a challenge, no easy money anymore -- let-your-money work-for-you -attitude, create the efficient portfolio!  If there are many children, I would do a competition over years' time-span or make many small competitions. Winner is the one whose portfolio is closest to some efficient portfolio such as lowest-variance-portfolio, I have the code to calculate things like that but it is trivial so build on the code below. Because the efficient frontier is a good way to let participants to investigate different returns and risk between assets classes like stocks, bonds and money, I would make the thing more serious. The winner could get his/her designed portfolio (to keep it fair in your budget, you could limit choices to index funds starting with 1EUR investment or to ask bottle-price-participation-fee, bring me a bottle and you are in. No money issue.). Since they probably don't have much money, I would choose free software.  Have fun! Step-by-step instructions for your own Efficient Frontier Copy and run the Python script with $ python simple.py > .datSimple Plot the data with $ gnuplot -e "set ylabel 'Return'; set xlabel 'Risk'; set terminal png; set output 'yourEffFrontier.png'; plot '.datSimple'" or any spreadsheet program. Your first "assets" could well be low-risk candies and some easy-to-stale products like bananas -- but beware, notice the PS.  Simple Efficient-frontier generator P.s. do not stagnate with collectibles, such as candies and toys, and retailer products, such as mangos, because they are not really good "investments" per se, a bit more like speculation. The retailer gets a huge percentage, for further information consult Bogleheads.org like here about collectible items.