Andrew Left, right, with his lawyer, arriving at court in Los Angeles. Bloomberg/Getty Images Prosecutors say short-seller Andrew Left manipulated the market and deceived retail investors. Two stock analysts who disagreed with Left's negative reports on stocks have testified. Left's defense has pressed the idea that disagreeing on stocks is normal and doesn't indicate fraud. Amid the complicated financial jargon at play in short-seller Andrew Left 's ongoing securities fraud trial, the defense has repeatedly returned to a simple question : Can't people disagree about stocks? Citron Research founder Left, known for his bets on GameStop and frequent appearances on financial shows, has been accused of manipulating the market and deceiving retail investors through misleading statements. Prosecutors allege Left said one thing about over 20 stocks and then traded in the opposite direction, making over $20 million in the process.…