A customer has an existing margin account that shows the following: Long Market Value: $100,000 Debit Balance: $60,000 If the market value declines to $60,000, the customer will receive a maintenance call for:

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.