The Salishan language Lushootseed shows an unusual pattern in its verbal morphology wherein its verbs are formed from intransitive, adjective-like roots via a highly productive set of suffixes, the bulk of which serve to increase the valency of their stem. These include the middle-marker, which forms intransitives, and several transitivizing affixes, which are shown here to be types of causative, their transitivizing effect being an expression of the causality inherent in the prototypical transitive event. In addition, the syntactic properties of the Lushootseed passive — formed by combining a transitivizing suffix with the middle-marker — can be analyzed as straightforward consequences of the meanings of the affixes that compose it. Treating Lushootseed causatives as subtypes of the transitive event model suggests that cross-linguistically transitive-causatives — as well as instrumentals and applicatives — may be subschematic extensions of the simple transitive clause, rather than derivations from more complex, biclausal structures.