Under Swiss law, and irrespective of the existence (and/or terms) of any document such as a letter of intent or a memorandum of understanding, entry into negotiations imposes certain duties on each party involved. In particular, each party has a general duty to negotiate in good faith, which may mean (for example) advising the other party about any decision not to pursue the transaction and not to continue negotiations in those circumstances.
While the conduct of negotiations does not in itself impose any duty to conclude an agreement or proceed with the contemplated transaction, a bad faith withdrawal from negotiations or other breaches of the pre-contractual duty to negotiate in good faith may cause the relevant party to be in breach of the requirement to act in good faith, so that the party in breach may be obliged to indemnify the other party for losses or damages that result from such breach. Note, however, that such indemnification would extend to costs incurred unnecessarily, as opposed to any lost profits or other potential losses. This form of pre-contractual liability is also known as the 'culpa in contrahendo.'