Other things being equal, an increase in the default risk of corporate bonds shifts the demand curve for corporate bonds to the ________ and the demand curve for Treasury bonds to the ________

When a firm's demand curve is tangent to its average total cost curve, the

a. firm's economic profit is zero. b. firm must be earning economic profits. c. firm must be incurring economic losses. d. firm must be operating at its efficient scale.

Why is oligopoly likely to be present in industries that see significant positive network effects?

What will be an ideal response?