Código Trigger...

CREATE OR REPLACE FUNCTION replicamueble() RETURNS TRIGGER AS $trigger_replicamueble$
BEGIN
    RAISE NOTICE 'Insertando en tabla mueble...';
    INSERT INTO mueblereplica values (NEW.nombre, NEW.precio);  
    RETURN NEW;
END;
$trigger_replicamueble$ LANGUAGE plpgsql;

CREATE TRIGGER trigger_repmueble
AFTER INSERT ON mueble
    FOR EACH ROW EXECUTE PROCEDURE replicamueble();