primary effect

2. In science, the first and most direct change caused by a treatment or action.

The primary effect of the medicine was to lower the fever.

3. In economics, the first change in spending or income before it spreads to other parts of the economy.

The primary effect of the new tax was higher prices at the store.

4. In psychology, the first strong impression that shapes how we remember something.

The primary effect made the first speaker seem the most convincing.