4. Please refer to the paper entitled "The Effect of Debt Market Imperfection on Capital Structure and Investment: Evidence from the 2008 Global Financial Crisis in Japan", by Hiromichi Iwaki (2019). Based on your understanding of the article, answer the following questions. a. What is the main purpose or objective of the study? Please explain clearly. b. Describe the statistical method/s that was/were used in the empirical analysis. c. Explain the following: I. ii. iii. iv. What type of organisations were used in the sample for observations? What is the size of the sample used in the study? State three (3) control variables used in the estimating the effect of credit crunch impact on debt. What is the main conclusion that was found from the study? Explain in your own words.