Examples

Here are some examples for sharing. If you are addicted to spectacle, play the money game instead. 

share your books
share a drilling machine with your neighbors
put together and buy (still!) a high-pressure cleaner
store the high-pressure cleaner in a collectively used workshop
bring your broken computer to a group specialized on repairing computers; they will have spare parts and knowhow
teach others how to sew
share your wireless internet connection