  Given a finite-to-one factor code $\pi: X \to Y$ between irreducible sofic
shifts and an ergodic $\nu$ on $Y$ with full support, it is known that the
fiber $\pi^{-1}_*(\nu)$ has at most $d_\pi$ ergodic measures in it where
$d_\pi$ is the degree of $\pi$. We introduce the notion of multiplicity for
ergodic measures on $X$ (that depends on $\pi$) and we prove that $d_\pi$ is
the sum of the multiplicity of $\mu$ where $\mu$ runs over the ergodic measures
in $\pi^{-1}_*(\nu)$. We also build an appropriate generalization to
infinite-to-one factor codes in relation to class degree and relatively maximal
measures. We also define the notion of degree joining (for finite-to-one factor
codes) and class degree joining (for infinite-to-one factor codes) which are
the main tool for establishing our results
