Explain the difference between the practices of 'bid shopping' and 'cover pricing in the context of tendering for construction projects. Your answer should address the following issues: define the practices, consider whether they are ethical and/or legal, discuss whether their usage is common within the construction industry, explain whether each practice is beneficial or detrimental to the construction industry, identify what the AS 4120 Code of Tendering states with respect to the practices and, in the case of cover pricing, refer to the facts of a real life case example where the Australian Competition and Consumer Commission has taken legal proceedings to prosecute parties within the construction industry.