DTM.3:5.3 - Spread changes compatibility without changing a learner

Consider a group comparing two exchange standards. Let f be the share of its relevant partners on the new standard. Over the same horizon, the group compares switching with continuing. Suppose it pays conversion costs while its old-standard partners keep their process unchanged. Its gain from switching is b−c−l(1−f): improvement b, switching cost c and conversion cost l for the remaining old-standard partner share.

Here the feedback is through compatible exchanges. No readiness state or training equation is needed. DTM.2 constructs the actual adoption event; the resulting adoption changes f and thus the gain available to later groups. A broadcast announcement is not the same as an authorized, affordable transition.

Use ECO.8 to retain the coordination and cost-bearing relations. Use the engineering compatibility method to establish that an adapter actually works. The spread model couples those supplied results rather than replacing them.