What factor forces even people who are very wealthy to face opportunity costs?

Even wealthy individuals face opportunity costs because resources, including time and capital, are limited and must be allocated among competing choices. When they invest in one opportunity, they forgo the potential benefits of others, regardless of their financial status. This trade-off applies to decisions about investments, time commitments, and personal pursuits, highlighting that every choice carries a cost in terms of what is sacrificed. Thus, opportunity costs are a fundamental aspect of decision-making for everyone, irrespective of wealth.