Suppose that the production-possibilities frontier of Knesch looks like this: Wheat Rye 90 0 80 30 50 50 0 60 Which of the following would shift this production-possibilities frontier to the right, that is, increase the possibilities that could be produced? More consumers Changes in tastes Improved varieties of wheat or rye A reduction of unemployment Choose the most correct answer by clicking a button, or by typing a letter from the keyboard and pressing the tab key.