noun, noun or participle which takes 'suru'
group buying; joint purchase; cooperative buying
Refers to a group of people pooling orders to buy something together, often to get a bulk discount or share shipping costs. Commonly used in online shopping and consumer contexts.
ネットで共同購入すると送料が安くなります。
If you do group buying online, the shipping costs become cheaper.
友人と共同
I made a joint purchase with friends and got a bulk discount.