Don't know if this is a good example, but I hope you get an idea of the chick-or-egg thing. In standard form, it's "which comes first, the chicken or the egg?" In actual use, this expression may vary into the "chicken-or-egg question", or "chicken-and-egg situation", or "chicken-or-egg paradox".
Here are media examples:
1. Most such deals raise capital in spite of constraints posed by credit ratings or financial covenants. But it's impossible to separate structured finance from the accounting methods corporations use to achieve it. That raises the chicken-or-egg question underscored by recent scandals: Can the deal stand on its economic merits or does it depend on favorable accounting?
"The fundamental rationale for structured financing is the value it creates" by unlocking otherwise inaccessible capital, argues Andrew T. Feldstein, head of structured financing products at JPMorgan Chase. "The vast majority of structured finance transactions were done for good economic reasons. The anecdotes you hear about are the ones that were done badly."
2. The basic unit of life is the cell (i.e. the prokaryote). What is a cell? A modern cell is a lipid-protein membrane enclosing a volume of chemicals at different concentrations. A cell is very complex. It has a selectively permeable membrane to allow certain molecules in or out. A cell has various metabolic pathways that help maintain cell integrity, and therefore prolong the existence of its complexity. A simple lipid bilayer is impermeable to polar molecules. On the other hand, a protein membrane is quite "leaky", allowing all kinds of molecules to pass through. A cell must retain certain molecules while removing others. For example, if a cell just had a simple lipid membrane enclosing different chemicals, simple chemical reactions would go to "completion" or to equilibrium. More chemicals would need to be brought in and waste products would need to be removed.
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