In real estate terminology, what does SOI stand for?

• A. Sum of Interest.
• B. Standard of Investment.
• C. Sphere of Influence.
• D. Social Opportunity Index.

Answer: (C)

Sphere of Influence refers to your personal network—family, friends, coworkers, past clients, neighbors—whose referrals can drive your real estate business. Agents grow and nurture their SOI by staying in regular contact and adding value so they remain top of mind when someone needs to buy or sell. This term is the standard way real estate practitioners describe the circle most likely to generate referrals. The other options aren’t real estate terms for this concept, so they don’t describe the referral network you rely on.