Rubber Duck
The rubber duck represents one of humanity's most accessible consumer goods. Average retail pricing hovers between one and five currency units in most global markets, placing ownership within reach of virtually all economic demographics. This democratic pricing structure has fuelled the species' worldwide proliferation.
Maintenance costs approach absolute zero. The rubber duck requires no feeding, no veterinary care, no insurance coverage, and no specialised housing. Total cost of ownership over a typical 20-year lifespan rarely exceeds the initial purchase price, representing an unparalleled value proposition in the companion market.
Godzilla
Acquiring a Godzilla presents insurmountable financial challenges. No legitimate market exists for purchasing kaiju, and the theoretical costs of creation would exceed most national GDPs. The creature's dietary requirements - presumably substantial given its mass - remain undocumented but certainly astronomical.
Indirect costs prove equally prohibitive. Property damage from a single Godzilla appearance typically runs into the hundreds of billions. Insurance premiums in Godzilla-prone regions reflect this reality. The monster is, by any reasonable accounting standard, economically catastrophic to possess or even encounter.