well there are many things.mow laws, babbysit,chores, sell some of your thingss,wash a car,walk a dog water a plant, sell lemonade---->hahah so old school
To by books
You can go to dragonsgrasp and talk to Doyle and do the quest Betrayal (you will need a dragon amulet)
earn some money for one
To earn fast money on Runescape, you need to mine essence in the Varrok mine and sell them in the exance.
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you can do chores by mowing lawns, help gardening. go ask if your neighbors need any help with anything. "Be nice"
if they want something they have to earn it. they need to earn the money then buy the thing they want. they need to learn how to earn money and how to survive in an economic crysis.
Since it is illegal for a business to hire anyone under 16 a 9 year old can earn money mowing lawns, feeding/walking dogs, asking your parents what they need done around the house so you can earn money. I am afraid 9 is a little young to babysit.
To earn money!
If you need to earn money you really have to work really hard in business
Mow lawns. People always need help with lawns and all you need is a lawn mower, nothing else.
Because they need money for stuff they want