如题：文献名称分别是
1. the threat of unionization the use of debt and the preservation of shareholder wealth
2. pricing strategy and financial policy
3. do financing constraints explain why investment is correlated with cash flow
4. understanding behavioral finance and the psychology of investing
5. a theory of financing constraints and firm dynamics
6. the impact of debt financing on entry and exit in a duopoly
7. Managing with Style: The Effect of Managers on Firm Policies