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Anyone’s guess if this topic gets a run in the exam.
Is your question about the impact of secondary issuances on spreads? If so, the reason spreads are affected is that it effects the order at which bondholders must be repaid if the company defaults. In other words, if a company issues more bonds then their total capital is increased, which reduces risk to those first in line: this reduction in risk should tend to reduce the risk premium on their bonds (those first in line). Of course from a market-level perspective it’s counterintuitive is that you would expect that increasing supply of bonds to a market should necessitate increasing the spread (to entice investors).
(not sure if that answer the question??)