black hole (BH), ending up as the only directly visible peak of a much larger, invisible structure. The so-called bias factor, $b(r,z)$, is used to explain the difference between visible structures and invisible matter, whose gravity governs the overall evolution of clustering. This complex relation is summarized by the simple formula $\xi(r,z)=b^{2}(r,z)\xi_{\rm m}(r,z)$, where $\xi(r,z)$ and $\xi_{\rm   
m}(r,z)$ are the two-point correlation functions (TPCF) of radiating objects and dark matter, respectively. In this way the detailed analysis of the distribution of the peaks of visible matter can distinguish among the various models for the formation of structures. In particular the [*hierarchical growth of structures*]{} is naturally predicted in a cold dark matter (CDM) scenario, where larger objects are constantly formed from the assembly of smaller ones. An alternative view of the structure formation and evolution, supported by both some observed properties of high-redshift ellipticals and EROs [@daddi01; @daddi02] and theoretical modeling [@lynden; @larson; @matteucci; @tantalo], leads to the scenario of [ *monolithic collapse*]{}, i.e. an earlier object formation and a following passive evolution. The clustering data can be used to discuss whether the merging processes were important at various redshifts or the galaxy number tends to be conserved during the 