Read the following passage regarding antitrust enforcement.
[1] For decades, antitrust enforcement in the United States has been guided almost exclusively by the consumer welfare standard, a legal doctrine that measures monopolistic harm primarily through the lens of increased consumer prices. [2] Under this framework, regulatory agencies have largely permitted massive consolidations within the digital technology sector, provided that the merged entities continue to offer free or heavily subsidized services to the public. [3] Some legal scholars defend this permissive approach, arguing that the rapid pace of digital innovation inherently prevents long-term market dominance, thereby rendering aggressive antitrust intervention both unnecessary and potentially stifling to technological advancement. [4] This defense, however, fundamentally misapprehends the unique economics of platform monopolies; the consumer welfare standard is wholly inadequate for regulating modern digital markets because it fails to account for how data consolidation and network effects allow tech giants to completely stifle competition without ever raising consumer prices. [5] By hoarding proprietary user data, these platforms create insurmountable barriers to entry for prospective competitors, effectively neutralizing the threat of innovation from smaller startups. [6] Consequently, the continued reliance on price-centric antitrust metrics will only ensure the entrenchment of anti-competitive practices that degrade user privacy and suppress broader economic dynamism.
Which sentence explicitly states the author's main point in the passage? Provide only the corresponding sentence number.
Answer: 4 / Sentence 4 / four / Four