Each of the following firms benefits from barriers to entry in its industry. Indicate whether each of the barriers is natural or government created. a. A small-town bar that is the only establishment in the county licensed to serve liquor.
b. A diamond company that owns nearly all of the world's diamond mines
c. A pharmaceutical company receives a patent for a new cancer-fighting drug
d. A soda company that spends over $3 billion on advertising every year
e. A waste-treatment plant that cost a lot to build even though it costs only two cents to treat each gallon of waste

Jenny​ walters, who owns a real estate​ agency, bought an old house to use as her business office. she found that the ceiling was poorly insulated and that the heat loss could be cut significantly if six inches of foam insulation were installed. she estimated that with the​ insulation, she could cut the heating bill by​ $80 per month and the​ air-conditioning cost by​ $70 per month. assuming that the summer season is three months​ (june, july, and​ august) of the year and that the winter season is another three months​ (december, january, and​ february) of the​ year, how much can jenny spend on insulation if she expects to keep the property for five​ years? assume that neither heating nor​ air-conditioning would be required during the fall and spring seasons. if she decides to install the​ insulation, it will be done at the beginning of may.​ jenny's interest rate is​ 6% compounded monthly.