High–low pricing (or hi–low pricing) is a type of pricing strategy adopted by companies, usually small and medium-sized retail firms, where a firm charges a high price for an item and later when the item's popularity has passed, sell it to customers by giving discounts or through clearance sales.
 The basic type of customers for the firms adopting high–low price will not have a clear idea about what a product's price would typically be or must have a strong belief that "discount sales = low price" or they must have strong preference in purchasing the products sold in this type or by this certain firm.
Light crude oil is liquid petroleum that has a low density and flows freely at room temperature.
 It has a low viscosity, low specific gravity and high API gravity due to the presence of a high proportion of light hydrocarbon fractions.
 It generally has a low wax content.
 Light crude oil receives a higher price than heavy crude oil on commodity markets because it produces a higher percentage of gasoline and diesel fuel when converted into products by an oil refinery.
Pennsylvania Grade Crude Oil is a type of sweet crude oil (sweet crude oil), found primarily in the Appalachian basin in the Marcellus Formation in the states of New York, Pennsylvania, Ohio, and West Virginia, and takes its name for the state of Pennsylvania, where it was first extracted in 1859 from the Drake Well.
 The area's Pennsylvania Grade Crude Oil has superior qualities and is free of asphaltic constituents, contains only trace amounts of sulfur and nitrogen, and has excellent characteristics for refining into lubricants.
 The success of drilling for oil at this well led to "an international search for petroleum, and in many ways eventually changed the way we live."
 There is archaeological evidence that Native Americans harvested "the oil for medicinal purposes by digging small pits around active seeps and lining them with wood" at least as far back as 1410 AD.
 European settlers skimmed the "oil from the seeps and using the petroleum as a source of lamp fuel and machinery lubrication."
Sweet crude oil is a type of petroleum.
 The New York Mercantile Exchange designates petroleum with less than 0.42% sulfur as "sweet".
 Petroleum containing higher levels of sulfur is called sour crude oil.
Crude oil washing (COW) is washing out the residue from the tanks of an oil tanker using the crude oil cargo itself, after the cargo tanks have been emptied.
 Crude oil is pumped back and preheated in the slop tanks, then sprayed back via high pressure nozzles in the cargo tanks onto the walls of the tank.
 Due to the sticky nature of the crude oil, the oil clings to the tank walls, and such oil adds to the cargo 'remaining on board' (the ROB).
 By COWing the tanks, the amount of ROB is significantly reduced, and with the current high cost of oil, the financial savings are significant, both for the Charterer and the Shipowner.
 If the cargo ROB is deemed as 'liquid and pumpable' then the charterers can claim from the owner for any cargo loss for normally between 0.3% up to 0.5%.
 It replaced the "load on top" and "seawater washing" systems, both of which involved discharging oil-contaminated water into the sea.
 MARPOL 73/78 made this mandatory equipment for oil tankers of 20,000 tons or greater deadweight.
Oil reserves in Libya are the largest in Africa and among the ten largest globally with 46.4 Goilbbl as of 2010.
 Oil production was 1.65 Moilbbl/d as of 2010, giving Libya 77 years of reserves at current production rates if no new reserves were to be found.
 Libya is considered a highly attractive oil area due to its low cost of oil production (as low as $1 per barrel at some fields in 2002), low sulfur content, being classified as "sweet crude" and in its proximity to European markets.
 Libya's challenge is maintaining production at mature fields, while finding and developing new oil fields.
 Most of Libya remains under-explored as a result of past sanctions and disagreements with foreign oil companies.
Brent Crude is a major trading classification of sweet light crude oil that serves as a major benchmark price for purchases of oil worldwide.
 This grade is described as light because of its relatively low density, and sweet because of its low sulphur content.
 Brent Crude is extracted from the North Sea and comprises Brent Blend, Forties Blend, Oseberg and Ekofisk crudes (also known as the BFOE Quotation).
 The Brent Crude oil marker is also known as Brent Blend, London Brent and Brent petroleum.
Enbridge Line 5 is a major oil pipeline in the Enbridge Lakehead System, which conveys petroleum from western Canada to eastern Canada via the Great Lakes states.
 Line 5 is particularly notable for passing under the environmentally sensitive Straits of Mackinac, which connect Lake Michigan to Lake Huron.
 As of December 2013, it is capable of carrying 540,000 oilbbl of oil per day.
 It carries synthetic crude, natural gas liquids, sweet crude, and light sour crude.
Sweet Crude is a documentary film by Sandy Cioffi about Nigeria's oil-rich Niger Delta.
 The film premiered in April 2009 at the Full Frame Documentary Film Festival and has since screened at 30 film festivals around the world and has won numerous awards.
Wal-Mart: The High Cost of Low Price is a 2005 documentary film by director Robert Greenwald and Brave New Films.
 The film presents a negative picture of Wal-Mart's business practices through interviews with former employees, small business owners, and footage of Wal-Mart executives.
 Greenwald also uses statistics interspersed between interview footage, to provide an objective analysis of the effects Wal-Mart has on individuals and communities.

Question: Are Wal-Mart: The High Cost of Low Price and Sweet Crude both documentary films?
Answer: yes