a replacement for the understanding of the data.
Runaway immigration can have its economic downsides. The Deloitte report noted that a large and sudden influx of immigrants can strain local and state-level budgets, while some research has found that immigration waves can lead to a short-term rise in housing prices. A 2025 Penn-Wharton analysis of the economic effects of Trump’s sweeping deportations also reported some potential wage benefits. It found that a 10-year campaign targeting unauthorized immigrants could lead to a 5% wage gain for low-skilled authorized immigrants and native-born Americans owing to less competition.
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Now, three researchers at the University of Pennsylvania, Alexander Platt, Daniel N. Harris, and Sarah Tishkoff, have done the converse analysis: examining the X chromosomes of the handful of completed Neanderthal genomes we have. It turns out there's also a strong bias toward modern human sequences there, as well, and the authors interpret that as selective mating, with Neanderthal males showing a strong preference for modern human females and their descendants.