Final answer:
The common characteristic among these organizations is that they all belong to business associations.
Step-by-step explanation:
The common characteristic among the world's largest business organization, mom and pop shops, local chambers, and the Chamber to be their voice in Washington DC is that they all belong to business associations.
Business associations are organizations that bring together multiple businesses within the same trade or industry. They allow competitors to join together to address common issues that may affect their entire industry, benefit from governmental policies, and advocate for their interests.
For example, the American Beverage Association includes competitors like Coca-Cola, Red Bull North America, ROCKSTAR, and Kraft Foods, but they share common interests related to the beverage industry and regulation of their business activities.