TY - JOUR T1 - The Choice between Formal and Informal Intellectual Property: A Review JO - Journal of Economic Literature PY - 2014/06/01 AU - Hall B AU - Helmers C AU - Rogers M AU - Sena V ED - DO - DOI: 10.1257/jel.52.2.375 PB - American Economic Association VL - 52 IS - 2 SP - 375 EP - 423 Y2 - 2025/06/28 ER -