  We estimate the high-energy behavior of the $\Theta^+$ and $\Lambda(1520)$
production cross sections in inclusive $pp$ collisions using the $K$ exchange
diagram. We show that the cross section of the $\Theta^+$-production is
suppressed compared to the production of $\Lambda(1520)$. As a byproduct we
also estimate the contribution of the $\pi$ exchange diagram for the inclusive
$\Lambda(1520)$ production in $\Sigma p$ collisions.
