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New videos from Khan Academy 2019-05-25T01:58:07.213214
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### Optimal Decision-making and opportunity costs

Mar, 2019-02-19 15:45
A rational agent considers all costs, including explicit and implicit costs, when deciding whether or not to undertake an action. In this video, learn about how opportunity costs represent the cost of the next best alternative.

### Introduction to production functions

Mar, 2019-02-19 15:45
Production functions describe how output is determined by various inputs. The short run is defined as the period of time in which at least one input is fixed. Anything longer than that is considered the long run.

Mar, 2019-02-19 15:45
When an economy goes from autarky to trade, this affects consumer and producer surplus in both countries.

### Marginal cost, average variable cost, and average total cost

Mar, 2019-02-19 15:45
In this video we calculate the costs of producing a good, including fixed costs, variable costs, marginal cost, average variable cost, average fixed cost, and average total cost.

### Substitution and income effects and the law of demand

Mar, 2019-02-19 15:45
The law of demand states that quantity demanded increases when price decreases, but why? Two reasons why the demand curve slopes downward are the substitution effect and the income effect. Learn about both in this video.

### Graphical impact of cost changes on marginal and average costs

Mar, 2019-02-19 15:45
See how changes in costs affect cost curves in this video.

### Sample free response question (FRQ) on tariffs and trade

Mar, 2019-02-19 15:45
Walk through the solution to a question on the effect of tariffs from the 2012 AP(R) Microeconomics exam.

### Total product, marginal product and average product

Mar, 2019-02-19 15:45
The short-run production function describes the relationship between output and inputs when at least one input is fixed, such as out output varies based on the amount of labor used. We can use this production function to find the total product of labor, the marginal product of labor, and the average product of labor.

### How price controls reallocate surplus

Mar, 2019-02-19 15:45
How a price ceiling or a price floor causes shortages or surpluses and reallocates surplus between consumers and producers.

### Profit maximization

Mar, 2019-02-19 15:45
Learn about the profit maximization rule, and how to implement this rule in a graph of a perfectly competitive firm, in this video.

### Marginal revenue and marginal cost in imperfect competition

Mar, 2019-02-19 15:45
This video discusses the differences in a graph of marginal cost and marginal revenue for an imperfectly competitive firm compared to a perfectly competitive firm.

### Masami Teraoka, American Kabuki

Mar, 2019-02-12 21:56
Masami Teraoka, American Kabuki (Oishiiwa), 1986, watercolor and sumi ink on paper mounted on a four-panel screen, 196.9 x 393.7 x 3 cm (de Young Museum, Fine Arts Museums of San Francisco), © Masami Teraoka Seeing America video Speakers: Emma Acker, Associate Curator of American Art, Fine Arts Museums of San Francisco and Steven Zucker

### Face to face with the voters: Bingham's Country Politician

Lun, 2019-02-11 02:19
George Caleb Bingham, Country Politician, 1849, oil on canvas, 51.8 x 61cm (Fine Arts Museums of San Francisco). Speakers: Emily Jennings, Director of School and Family Programs, Fine Arts Museums of San Francisco and Steven Zucker A Seeing America video

### The Utrecht Psalter and its influence

Sáb, 2019-02-09 04:48
The Utrecht Psalter, c. 825, Hautvilliers, near Reims, France, 380 x 310 mm (Universiteitsbibliotheek, Utrecht, MS 32, ff. 7v–8r), courtesy Universiteitsbibliothek, Utrecht; The Harley Psalter, early 11th century, Christ Church, Canterbury, 380 x 310 mm (British Library, BL, Harley MS 603, ff. 7v 8r), © 2019 British Library, used by permission; and the The Eadwine Psalter, c. 1150, Christ Church, Canterbury, 460 x 330 mm (Cambridge, Trinity College, MS R. 17.1, ff. 23v–24r) A conversation with Dr. Kathleen Doyle, Lead Curator, Illuminated Manuscripts, British Library and Dr. Beth Harris

### Codex Amiatinus, the oldest complete Latin Bible

Sáb, 2019-02-09 02:58
Codex Amiatinus, before 716, Wearmouth-Jarrow, c. 505 x 340 mm (Biblioteca Medicea Laurenziana, Florence, MS Amiatino 1) Speakers: Dr. Claire Breay, Head of Ancient, Medieval and Early Modern Manuscripts and Dr. Beth Harris

### The Lindisfarne Gospels

Sáb, 2019-02-09 00:49
The Lindisfarne Gospels, c. 700 (Northumbria), 340 x 250 mm (British Library, Cotton MS Nero D IV) © 2019 British Library, used by permission Speakers: Dr. Kathleen Doyle, Lead Curator, Illuminated manuscripts, British Library and Dr. Steven Zucker

### The Peaceable Kingdom as Pennsylvania parable

Dom, 2019-02-03 21:57
Edward Hicks, The Peaceable Kingdom, 1826, oil on canvas, 83.5 x 106 cm (Philadelphia Museum of Art) Speakers: Barbara Bassett, Curator of Education, School and Teacher Programs at the Philadelphia Museum of Art and Beth Harris A Seeing America video

### Heroes of modern surgery: Eakins' Dr. Gross and Dr. Agnew

Dom, 2019-02-03 14:51
Thomas Eakins, Portrait of Dr. Samuel D. Gross (The Gross Clinic), 1875, oil on canvas, 243.8 x 198.1 cm (Philadelphia Museum of Art) and Thomas Eakins, The Agnew Clinic, 1889, oil on canvas, 214 cm × 300 cm (Philadelphia Museum of Art) A conversation with Dr. Kathleen A. Foster, The Robert L. McNeil, Jr., Senior Curator of American Art, and Director, Center for American Art at the Philadelphia Museum of Art A Seeing America video