1.
Debt can be a death sentence. Party City needed $115M/year for stores and e-commerce but had to pay lenders instead—they couldn't compete.
2.
Demographic tailwinds reverse. Fewer kids plus different parenting values meant the 'peak party' era ended—and the business model died with it.
3.
Fragility kills during shocks. Helium shortage, COVID, bullwhip effect—any one might've been survivable, but stacked headwinds crushed a leveraged business.