en.m.wikipedia.org/wiki/Gentlemen`s_agreement contains details on the use of the term in commerce and commerce. Gentlemen`s agreements were a widespread discriminatory tactic, which would have been more common than restrictive alliances to maintain the homogeneity of upper-class neighborhoods and suburbs in the United States.  The nature of these agreements made it extremely difficult to prove or follow them, and they were long after the U.S. Supreme Court decisions in Shelley/. Kraemer and Barrows v. Jackson.  A source indicates that the gentlemen`s agreements are „probably still in place” but that their use has declined sharply.  In 2016, the British High Court agreed, after careful consideration of the evidence, that a gentleman`s agreement could be legally binding. All online dictionaries say that the phrase never refers to a written agreement.
But Wikipedia says: „It`s usually oral, although it can be written.” Sometimes, when the parties know each other very well, it may even be a non-verbal agreement. Gentlemen`s agreements have come to regulate international activities as the coordination of monetary or trade policies.  According to Edmund Osmasczyk in the United Nations Encyclopedia and International Agreements, it is also defined as „an international term for an oral and unwritten but fully valid agreement.”  This type of agreement may allow a nation to circumvent national legal requirements to enter into a formal contract or it may be useful for a government to want to enter into a secret agreement that does not engage the next government.  According to another author, all international agreements are gentlemen`s agreements because, just before the war, they are all unenforceable.  Osmaczyk noted that there was a difference between gentlemen`s open agreements and secret diplomatic agreements.  In the United States, in 1890, the prohibition of gentlemen`s agreements was introduced in interstate trade relations because the secrecy of these agreements was beyond anyone`s control.  In the automotive industry, Japanese manufacturers have agreed that no standard vehicle would have more than 276 hp (206 kW; 280 hp); The agreement ended in 2005.  German manufacturers limit the maximum speed of high-performance sedans (berlines) and breaks to 250 km/h.   When the Suzuki Hayabusa motorcycle exceeded 310 km/h in 1999, fears of a European ban or regulatory intervention led Japanese and European manufacturers to limit to 300 km/h at the end of 1999 See list of the fastest series bikes.
What took you to follow the gentleman`s agreement? Please tell us where you read or heard it (including the quote, if possible). A gentleman`s agreement is an informal and non-binding agreement in which the parties trust each other to keep their promises. We can also use the plural and say „gentlemen`s agreement”. It is generally not a document, i.e. there are no signatures, papers or fonts. When one party breaks the agreement, the others generally do not have recourse to the courts. Simply put, a gentleman`s agreement does not have the force of law in most places. However, in the United Kingdom, this type of agreement can be legally binding (see the last part of this article). Until Jackie Robinson was hired by the Brooklyn Dodgers in 1946, a gentlemen`s agreement ensured that African-American players were excluded from organized baseball.  In English contract law, for an agreement to be binding, legal relations must be considered; but in trade (i.e.