Resources
The next shellfish will be yours, but this shellfish will be mine. These are the resources we have to share and distribute.
Our resources are based around a system of trading shellfish. It's not that weird, plenty of ancient societies used shellfish as their main resource!
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You save up all of your resources so you can buy a sheep (し). You bring a big sack of your shellfish resources to the market and finally get to pick out that sheep you've had your eyes on for months.
Of course you're going to use your resources to get a sheep. You're living in a time when shellfish are used to trade for goods and services!