Abstract : For a poset $P=(X, \le_P)$, the linear discrepancy of $P$ is the minimum value of maximal differences of all incomparable elements for all possible labelings. In this paper, we find a lower bound and an upper bound of the linear discrepancy of a product of two posets. In order to give a lower bound, we use the known result, $\ld(\mathbf{m} \times \mathbf{n}) = \left\lceil \frac{mn}{2} \right\rceil -2$. Next, we use Dilworth's chain decomposition to obtain an upper bound of the linear discrepancy of a product of a poset and a chain. Finally, we give an example touching this upper bound.

Keywords : poset, product of posets, linear discrepancy