HLSS 311 Week 3 forum APU

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Define pay riding. What is free riding? Over time, can the unilateral solution likely turn into a multilateral one?
" Is it cost effective to spend millions and millions of dollars in an effort to stop a hand-full of people " who are bound to terrorize the United States?
What is the " Hardened Border Paradox? What is the " Open Border Paradox? How can both be overcome?