The lex loci solutionis is the Latin

Latin

Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 term for "law of the place where relevant performance occurs" in the conflict of laws

Conflict of laws

Conflict of laws is a set of procedural rules that determines which legal system and which jurisdiction's applies to a given dispute...

. Conflict is the branch of public law

Public law

Public law is a theory of law governing the relationship between individuals and the state. Under this theory, constitutional law, administrative law and criminal law are sub-divisions of public law...

 regulating all lawsuit

Lawsuit

A lawsuit or "suit in law" is a civil action brought in a court of law in which a plaintiff, a party who claims to have incurred loss as a result of a defendant's actions, demands a legal or equitable remedy. The defendant is required to respond to the plaintiff's complaint...

s involving a "foreign" law element where a difference in result will occur depending on which laws are applied.

Explanation

When a case comes before a court

Court

A court is a form of tribunal, often a governmental institution, with the authority to adjudicate legal disputes between parties and carry out the administration of justice in civil, criminal, and administrative matters in accordance with the rule of law...

 and all the main features of the case are local, the court will apply the lex fori

Lex fori

Lex fori is a legal term used in the conflict of laws used to refer to the laws of the jurisdiction in which a legal action is brought...

, the prevailing municipal law

Law

Law is a system of rules and guidelines which are enforced through social institutions to govern behavior, wherever possible. It shapes politics, economics and society in numerous ways and serves as a social mediator of relations between people. Contract law regulates everything from buying a bus...

, to decide the case. But if there are "foreign" elements to the case, the forum court may be obliged under the conflict of laws system to consider:

• whether the forum court has jurisdiction
  Jurisdiction
  Jurisdiction is the practical authority granted to a formally constituted legal body or to a political leader to deal with and make pronouncements on legal matters and, by implication, to administer justice within a defined area of responsibility...
  
   to hear the case (see the problem of forum shopping
  Forum shopping
  Forum shopping is the informal name given to the practice adopted by some litigants to get their legal case heard in the court thought most likely to provide a favorable judgment...
  
  );
• it must then characterise
  Characterisation (conflict)
  In conflict of laws, characterisation is the second stage in the procedure to resolve a lawsuit involving a foreign law element. This process is described in English law as classification and as qualification in French law...
  
   the issues, i.e. allocate the factual basis of the case to its relevant legal classes; and
• then apply the choice of law
  Choice of law
  Choice of law is a procedural stage in the litigation of a case involving the conflict of laws when it is necessary to reconcile the differences between the laws of different legal jurisdictions, such as sovereign states, federated states , or provinces...
  
   rules to decide which law is to be applied to each class.

The lex loci solutionis is one of the possible choice of law rules applied to cases testing the validity of a contract

Contract (conflict)

In the conflict of laws, the validity of a contract with one or more foreign law elements will be decided by reference to the so-called "proper law" of the contract.-History:...

 and in tort

Tort (conflict)

In conflict of laws, the choice of law rules for tort are intended to select the lex causae by which to determine the nature and scope of the judicial remedy to claim damages for loss or damage suffered.-History:...

 cases. For example, suppose that a person domiciled

Domicile (law)

In law, domicile is the status or attribution of being a permanent resident in a particular jurisdiction. A person can remain domiciled in a jurisdiction even after they have left it, if they have maintained sufficient links with that jurisdiction or have not displayed an intention to leave...

 in Bolivia

Bolivia

Bolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...

 and a person habitually resident in Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

, make a contract by e-mail. They agree to meet in Arizona

Arizona

Arizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...

 to research a book. The possibly relevant choice of law rules would be:

• the lex domicilii
  Lex domicilii
  The lex domicilii is the Latin term for "law of the domicile" in the conflict of laws. Conflict is the branch of public law regulating all lawsuits involving a "foreign" law element where a difference in result will occur depending on which laws are applied....
  
  , lex patriae
  Lex patriae
  The term lex patriae is Latin for the law of nationality in the conflict of laws which is the system of public law applied to any lawsuit where there is a choice to be made between several possibly relevant laws and a different result will be achieved depending on which law is...
  
  or the law of habitual residence to determine whether the parties had the capacity
  Capacity (law)
  The capacity of both natural and legal persons determines whether they may make binding amendments to their rights, duties and obligations, such as getting married or merging, entering into contracts, making gifts, or writing a valid will...
  
   to enter into the contract;
• the lex loci contractus
  Lex loci contractus
  In the conflict of laws, the lex loci contractus is the Latin term for "law of the place where the contract is made".-Explanation:When a case comes before a court and all the main features of the case are local, the court will apply the lex fori, the prevailing municipal law, to decide the case...
  
  which could be difficult to establish since neither party left their own state (reliance on postal rules for offer and acceptance
  Offer and acceptance
  Offer and acceptance analysis is a traditional approach in contract law used to determine whether an agreement exists between two parties. Agreement consists of an offer by an indication of one person to another of the offeror's willingness to enter into a contract on certain terms without...
  
   in the several putative lex causae
  Lex causae
  In the conflict of laws, lex causae is the law or laws chosen by the forum court from among the relevant legal systems to arrive at its judgement of an international or interjurisdictional case....
  
  might produce different results);
• the lex loci solutionis might be the most relevant since Arizona is the most closely connected to the substance of the obligations assumed;
• the proper law
  Proper law
  The Doctrine of the Proper Law is applied in the choice of law stage of a lawsuit involving the conflict of laws.-Explanation:In a conflicts lawsuit, one or more state laws will be relevant to the decision-making process. If the laws are the same, this will cause no problems, but if there are...
  
  ; and
• the lex fori which might have public policy
  Public policy (law)
  In private international law, the public policy doctrine or ordre public concerns the body of principles that underpin the operation of legal systems in each state. This addresses the social, moral and economic values that tie a society together: values that vary in different cultures and change...
  
   issues if, say, one of the parties was an infant
  Minor (law)
  In law, a minor is a person under a certain age — the age of majority — which legally demarcates childhood from adulthood; the age depends upon jurisdiction and application, but is typically 18...
  
  .