Question: Pablo Picasso's La Gommeuse was auctioned at Sotheby's as part of the collection of a businessman estimated to have a net worth of how much?
Context: Dimitri Mavrommatis is a Greek born asset manager and art collector based in Switzerland with additional residences in Paris, London and New York City.  He was on the European advisory board of Christie's and the international advisory board of Sotheby's.  In 2014 Sotheby's Geneva featured Mavrommatis' gems in their November jewelry sale in an event the auction house titled "The Passion of Collecting".  In 2012 ARTnews editor Milton Esterow listed Mavrommatis in the magazine's yearly top ten list of the worlds' 200 premiere art collectors.  In addition to possessing a sizable collection of contemporary art including significant pieces by Pablo Picasso, Joan Miro, Alexander Calder, Andy Warhol and Christopher Wool, Mavrommatis owns one of the most important collections of Sèvres porcelain on the planet.He also sold at Sotheby's one of the most important jewelry collections in the world with two new records for a sapphire and a ruby. La Lecture (or Reading) is a painting by Spanish artist Pablo Picasso completed in January 1932.  The oil painting depicts Picasso's mistress and muse, Marie-Thérèse Walter, asleep with a book upon her lap.  The painting led to the breakup of Picasso's marriage to Olga Khokhlova after she saw it at a retrospective exhibition and realised that the facial features were not her own.  The painting went to auction in 1989 and in 1996, where it failed to sell.  In January 2011, it was announced that "La Lecture" would be going to auction on 8 February.  The painting, which had not been seen in Europe since the exhibition, was then displayed at Sotheby's in Paris. Gertrude Stein wrote "If I Told Him : A Completed Portrait of Picasso” in 1923.  It was first published in "Vanity Fair" in 1924 and she subsequently published it in her collection "Portraits and Prayers".  This poem was part of a multi-decade intertextual dialogue between Stein and Pablo Picasso.  Stein was one of the first to exhibit Picasso’s paintings at her weekly salons at 27 rue de Fleurus.  In 1906, Picasso completed a portrait of Stein, and the following year, she wrote her first literary portrait of Picasso, titled “Picasso.”  Over a decade later, when the two were no longer working as closely together, she wrote this second portrait, notable for its non-representational style. Pablo Picasso and the Ballets Russes collaborated on several productions.  Pablo Picasso's Cubist sets and costumes were used by Sergei Diaghilev in the Ballets Russes's "Parade" (1917, choreography: Léonide Massine), "Le Tricorne" ("The Three-Cornered Hat") (1919, choreography: Massine), "Pulcinella" (1920, choreographer: Massine), and "Cuadro Flamenco" (1921, choreography: Spanish folk dancers).  Picasso also drew a sketch with pen on paper of "La Boutique fantasque" ("La course"), (1919, choreography: Massine).  and designed the drop curtain for "Le Train Bleu" (1924, choreography: Bronislava Nijinska), based on his painting, "Two Women Running on the Beach" ("The Race"), 1922. William Ingraham Koch ( ; born May 3, 1940) is an American businessman, sailor, and collector.  His boat was the winner of the America's Cup in 1992. " Forbes" estimated Koch's net worth at $4 billion in 2012 from oil and other investments. La Gommeuse is a 1901 oil on canvas painting by the Spanish artist Pablo Picasso.  It dates from his so-called Blue period and is noted for its caricature of Picasso's friend Pere Mañach painted on the reverse.  It was offered for sale "ex" the William I. Koch collection at a Sotheby's, New York, auction on 5 November 2015.  The painting realized $67.5 million at the sale, a record for a Blue period Picasso and placing the painting among the most expensive ever sold. Picasso's Rose Period represents an important epoch in the life and work of the Spanish artist Pablo Picasso and had a great impact on the developments of modern art.  It began in 1904 at a time when Picasso settled in Montmartre at the Bateau-Lavoir among bohemian poets and writers.  Following Picasso's Blue Period, depicting themes of poverty, loneliness, and despair in somber tones of daunting blues, Picasso's Rose Period represents more pleasant themes of clowns, harlequins, carnival performers, depicted in cheerful vivid hues of red, orange, pink and earth tones. Based largely on intuition rather than direct observation, Picasso's Rose Period marks the beginning of the artists' stylistic experiments with primitivism; influenced by pre-Roman Iberian sculpture, Oceanic and African art.  This led to Picasso's African Period in 1907, culminating in the Proto-Cubist "Les Demoiselles d'Avignon", regarded as a masterpiece. Sylvette is the title of a portrait painting by Pablo Picasso, featuring a young woman with a pony tail.  The model for the painting, Lydia Sylvette David, also known by her married name Lydia Corbett, was a French woman who, during the summer of 1953, worked in a pottery studio near Picasso's studio in Vallauris.  Finding her appearance appealing, Picasso created 40 works inspired by her.  Sylvette's portrait from 2 May 1954 is one of the last of a long series.  Picasso's grandson Olivier Widmaier Picasso told the "Chicago Sun-Times" in 2004 that Sylvette was also the subject of the monumental Chicago Picasso, which had been a matter of curiosity since it was unveiled.  She was said to have been an inspiration for actress Brigitte Bardot and the Roger Vadim film "And God Created Woman".  In 1998 Barron's published "Picasso and the Girl With a Ponytail" by Laurence Anholt—a children's book in which a shy teenager named Sylvette meets Picasso in Vallauris and becomes his model. Asset poverty is an economic and social condition that is more persistent and prevalent than income poverty.  It can be defined as a household’s inability to access wealth resources that are sufficient to provide for basic needs for a period of three months.  Basic needs refer to the minimum standards for consumption and acceptable needs.  Wealth resources consist of home ownership, other real estate (second home, rented properties, etc.), net value of farm and business assets, stocks, checking and savings accounts, and other savings (money in savings bonds, life insurance policy cash values, etc.).  Wealth is measured in three forms: net worth, net worth minus home equity, and liquid assets.  Net worth consists of all the aspects mentioned above.  Net worth minus home equity is the same except it does not include home ownership in asset calculations.  Liquid assets are resources that are readily available such as cash, checking and savings accounts, stocks, and other sources of savings.  There are two types of assets: tangible and intangible.  Tangible assets most closely resemble liquid assets in that they include stocks, bonds, property, natural resources, and hard assets not in the form of real estate.  Intangible assets are simply the access to credit, social capital, cultural capital, political capital, and human capital. The Fundación Picasso, also known as the Pablo Ruiz Picasso Foundation, is a foundation based in Málaga, Andalusia, Spain with the objective of promoting and promulgating the work of the artist Pablo Picasso.  They are headquartered in the home on the Plaza de la Merced that was his birthplace, now the Museo Casa Natal ("Birthplace Museum"), one of the world's many Picasso museums.
Answer: $4 billion