Signal Decay Half-Life

Signal Decay Half-Life treats every lead-generation signal as perishable inventory. A funding round, a job posting, a website visit, or a leadership change has a usable window measured in days, not quarters, and the value of that signal drops sharply once the trigger moment passes. Agencies that timestamp signals at capture and route them into outreach within 72 hours win reply rates that list-only competitors cannot match, because the prospect still remembers the context that made them relevant. The framework forces a delivery decision: which signals justify same-day human follow-up, which can sit in a nurture sequence, and which should be discarded rather than recycled into a stale list. It also reframes retainer pricing. A client paying for continuous signal monitoring is buying freshness, not volume, and freshness is the part a competitor cannot copy by exporting the same database. The practical test is simple: for every lead in a campaign, can the agency name the trigger and the date it fired?