Long-run adjustments in purely competitive markets primarily take the form of

1. variations in the cost curves of different firms in the market.
2. entry or exit of firms in the market.
3. evolution of the market from a constant-cost to an increasing-cost industry.
4. product differentiation.

2. entry or exit of firms in the market.

Explanation:

A perfect competitive market is when there are many buyers and sellers of homogenous goods and services.

Firms sell homogenous products both in the short and long run.

There are no barriers to entry and exit of firms into the market.

Firms in a perfect competition earn zero economic profit in the long run. If in the short run, firms make economic profit, firms enter into the market in the long run.

If in the short run, firms make economic profit, firms leave the market in the long run.

both are integral parts of a corporate balance sheet. the cash flow statement, or statement of cash flows, measures the sources of a company's cash and its uses of cash over a specific time period. the income statement measures a company's financial performance, such as revenues, expenses, profits or losses over a specific time period (in fact, it's sometimes called a statement of financial performance).

a cash flow statement shows exactly how much money a company has received and how much it has spent, traditionally over a period of one month. it captures the current operating results and changes on the balance sheet, such as increases or decreases in accounts receivable or accounts payable, and does not include noncash accounting items such as depreciation and amortization. the cash flow generally comes from revenue received as a result of business activity, but it may be augmented by funds available as a result of credit. a cash flow statement is used to determine the short-term viability and liquidity of a company, specifically how well it is positioned to pay its bills and vendors.