Consumption efficiency is the ratio of value received to money spent — not whether you can afford your purchases, but whether what you buy is actually being used and enjoyed. A person with a $4,000/month discretionary budget who uses 90% of what they buy is a highly efficient consumer. A person with a $1,000/month budget who uses 40% is a low-efficiency consumer, losing 60% of their spending to items that sit unused, food thrown away, and services forgotten. The Consumption Efficiency Score measures this across five categories: Subscriptions (what percentage of your subscription spending are you actively using?), Food (how much grocery spending goes to waste, and is dining proportionate to cooking?), Clothing (what percentage of clothes bought are actually worn regularly?), Tech and Gadgets (are your devices and apps in active use?), and Home Items (do your home purchases deliver ongoing value?). Each category scores 0–20 for a 0–100 total. The financial impact of low efficiency is significant: spending $150/month on clothing with 50% wear rate means $75/month in consumption waste — $16,000 over 10 years in compound opportunity cost. Unused subscriptions typically add another $50–150/month, food waste $40–120/month, and tech accumulation $20–60/month. Together, the low-efficiency consumer can waste $200–500/month on goods that produce no ongoing value in their life.