Discuss why the decline of union penetration, combined with the rise of Human Resources Mana​‌‍‌‍‍‌‌‌‍‌‌‌‍‍‍‍‌‍‌​gement means that Industrial Relations has little contemporary relevance for business

Industrial Relations evolved in the late 19th Century, and could be seen as both a guide to, and constraint upon, management practices throughout the most to the 20th Century. However, the decline of union penetration, combined with the rise of Human Resources Mana​‌‍‌‍‍‌‌‌‍‌‌‌‍‍‍‍‌‍‌​gement means that Industrial Relations has little contemporary relevance for business