Self-similarity of hadron production: $z$-Scaling

We briefly review $z$-scaling as a reflection of the self-similarity of hadron production in high-energy hadron and nuclear collisions and discuss the basic principles of constituent interactions (locality, self-similarity, and fractality). We present results of analyzing experimental data on the inclusive $p_T$ spectra of hadron and jet production at the RHIC, Tevatron, and LHC in the framework of $z$-scaling.