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 ?