In an era defined by hyper-concentration and intricate vertical integration, the lines between "aggressive, but legitimate competition" and "anticompetitive unilateral conduct" have never been more blurred. Worldwide, the traditional toolkit of antitrust enforcement against dominant companies - unilateral conduct, monopolisation, and economic dependency - is undergoing a radical transformation.

With the EU poised to release its landmark guidelines and global jurisdictions pivoting toward more assertive stances, the legal landscape is shifting beneath our feet. This panel moves beyond the theory to tackle the high-stakes realities of modern enforcement and will discuss, amongst others, the following topics:

• Redefining the boundaries: Is "market definition" still a viable anchor in a world of ecosystem competition, or is it becoming an analytical relic? (e.g. Moving from product-based silos to multi-sided platform ecosystems.)
• The burden of proof: How are new evidentiary presumptions flipping the script on how we establish dominance? (e.g. The shift toward reparable harm and structural presumptions in digital markets)
• Economic dependency: As platforms become "essential partners" for smaller players, where does legitimate bargaining end and abuse begin? (e.g. Android Auto- to what extent must dominant platforms provide third-party access to their proprietary ecosystems?). Should there be more room for antitrust enforcement against non-dominant players on whom other market players are economically dependent?