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Adaptive capacity with cost-efficient resource provisioning is a crucial capability for future 6G networks. In this work, weconceptualize “expansive networks” which refers to a networkingparadigm where networks should be able to extend their resourcebase by opportunistic but self-controlled expansive actions. To thisend, we elaborate on a key aspect of an expansive network as aconcrete example: Spectrum resource at the PHY layer. Evidently,future wireless networks need to provide efficient mechanisms tocoexist in the licensed and unlicensed bands and operate in expansive mode. In this work, we first describe spectrum sharing issuesand possibilities in 6G networks for expansive networks. We thenpresent security implications of expansive networks, an importantconcern due to more open and coupled systems in expansive networks. We also discuss two key enablers, namely distributed ledgertechnology (DLT) and network intelligence via machine learning,which are promising to realize expansive networks for the spectrum sharing aspect.