Which of the following statements is correct?A. Economists consider opportunity costs to be included in a firm's total revenues. B. Economists consider opportunity costs to be included in a firm's costs of production. C. Opportunity costs equal explicit minus implicit costs. D. All of the above are correct.

4. project memo your supervisor has asked you to create a final copy of a memo announcing a special project. open the microsoft® word file ch01 memo from the data files. edit the memo to correct errors in keyboarding, punctuation, spelling, and word usage. submit the edited document to your instructor along with this assignment.to: department supervisorsfrom: tomas perezdate: january 3, 20--subject: playground projectas you now, are offices are close each year on observance of martin luther king, jr. day. this year, the company is organizing a service project for that day. we will be clean up the grove street playground and panting bushes, blubs, and flowers. the company is donating now playground equiptment and park benches. cleanup gear and tools will be provided, and a cook out will conclude the days’ activities. farther information will be provided as the date draws nearer. encourage the employee in you department too participate in this worthwhile effort.

Alpha company uses the periodic inventory system for purchase & sales of merchandise. discount terms for both purchases & sales are, 2/10, n30 and the gross method is used. unless otherwise noted, fob destination will apply to all purchases & sales. the value of inventory is based on periodic system. on january 1, 2016, beginning inventory consisted of 350 units of widgets costing $10 each. alpha prepares monthly income statements. the following events occurred during the month of jan.: dateactivitya.jan. 3purchased on account 350 widgets for $11 each.b.jan. 5sold on account 400 widgets for $30 each. paid freight out with petty cash of $150.c.jan. 10purchased on account 625 widgets for $12 each.d.jan. 11shipping cost for the january 10 purchased merchandise was $400 was paid with a cheque by alpha directly to the freight company.e.jan. 12returned 50 widgets received from jan. 10 purchase as they were not the correct item ordered.f.jan. 13paid for the purchases made on jan. 3.g.jan. 21sold on account 550 widgets for $30 each. paid freight out with petty cash of $250.h.jan. 22authorize credit without return of goods for 50 widgets sold on jan. 21 when customer advised that they were received in defective condition.i.jan. 25received payment for the sale made on jan. 5.j.jan. 26paid for the purchases made on jan. 10.k.jan. 31received payment for the sale made on jan. 21.use this information to prepare the general journal entries (without explanation) for the january events. if no entry is required then enter the date and write "no entry required."

Nextdoor is an instant messaging application for smartphones. new smartphone users find it easier to connect with friends and relatives through this mobile app when compared to other similar instant messaging applications. hence, it has the largest user base in the industry. thus, nextdoor app's value has increased primarily due to itsa. learning curve effects. b. economies of scale. c. economies of scope. d. network effects.