Answer:
d.the company is precisely breaking even.
Explanation:
Margin of safety is referred to current sales - Break even sales ratio to current sales as a percentage.
Basically it is quoted as follows:

Therefore, when the current sales = Break even sales then only the company will have margin of safety = 0
Thus, at 0 margin of safety the company basically is at no profit no loss situation, that is break even.
Answer:
Increase the aggregate demand. This means, that the total demand for goods and services within a particular market will increase
Explanation:
The future expectations of an improving economy increase the aggregate demand. This means, that the total demand for goods and services within a particular market will increase as there is more trust in the market.
The rise in the income is another important factor for the aggregate demand to increase. With improving expectations the consumers will think that they income will improve and therefore their consumption levels.
Examples of barriers to entry include Patents.
<h3>What Are Barriers to Entry? </h3>
A term used in economics and business to describe variables that can deter or make it difficult for newcomers to enter a market or industry sector and so limit competition is "barriers to entry." These might include prohibitive startup fees, bureaucratic roadblocks, or other barriers that make it difficult for new rivals to enter a market. Existing businesses win from entrance barriers because they preserve their market share and capacity to make money.
There are four main types of barriers to entry:
- legal (patents/licenses),
- technical (high start-up costs/monopoly/technical knowledge),
- strategic (predatory pricing/first mover),
- brand loyalty.
Most people think of patents as temporary entry barriers put in place by the government. Patent protection, however, typically restricts access rather than blocking it. A business may enter a market that is protected as long as its product complies with a minimum standard of novelty and does not violate any active patents.
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The largest area of job growth in the United States has been in the service sector.
<h3>What are the service sectors?</h3>
The service sector is commonly known as the tertiary sector. It is also known to be the third tier in the three-sector economy.
An Examples of service sector jobs are housekeeping, nursing, etc. The Service industries is made up of:
- Banking
- Communications
- Wholesale and retail trade, etc.
Conclusively, The largest area of job growth in the United States as at 1970s has been in the service sector.
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