The United States is stuck in a 'Peter Pan economy," according to Bank of America Merrill Lynch.
Gold rose more than 1 percent on Friday, supported by a softer dollar and cautious interest rate comments.
Sterling rose as traders evaluated whether the killing of MP Jo Cox may alter the balance of opinion on Brexit.
Crestone Wealth Management's David Sokulsky explains why U.S. and Japan markets might benefit from U.K. leaving the EU.
Yen interventions carried out in the past did not have long-term impacts, says Standard Chartered WM's Manpreet Gill.
The yen's steep climb this month has spurred a startle response among Japan's policymakers who face a fish stew of forces pushing the currency higher.
Sunrise Brokers Ben Collett says investors shouldn't buy Japanese exporters because the Nikkei will weaken before the yen does.
Kapstream Capital Kumar Palghat says the problem for Japan's policymakers is that whenever it is a risk-off environment, the yen becomes a safe haven.
Japan will require the agreement of the other G7 members before it can intervene in the currency markets, believes ANZ's Khoon Goh.
Central banks usually tend to intervene when market liquidity is low, says Merk Investment's Axel Merk.
Haitong Intl Securities Group's Kevin Leung says that Asian market's upwards moves are being driven by short-term news flow about the yen and Brexit.
Westpac Bank's Sean Callow says the BOJ would not be the only central bank to potentially intervene in the currency market if U.K. votes for a Brexit.
Former Japanese Vice Finance Minister Eisuke Sakakibara says policymakers won't conduct a yen intervention because of opposition from the U.S.
Parry IntlTrading's Gavin Parry says Japanese policymakers will likely discuss currency coordination, particularly after the big jump in the yen.
If a Brexit does happen, the USD/JPY pair could easily fall below 100 levels and even touch 95, notes BAML FX Strategist Shusuke Yamada.
Huntington Bank CIO John Augustine says markets will remain hostage to the Brexit opinion polls until a decision has been reached.
BNP Paribas' Mirza Baig says BI's 25 basis points rate cut on Thursday is a sign of confidence in the rupiah's strength and stability.
The rally in the Japanese currency doesn't appear to be stopping anytime soon and its strength has traders worried it could quash a struggling economy.
Sterling rallied from a two-month low against the euro, extending gains after British police said British lawmaker Jo Cox died.
The central bank's decision sparks speculation on whether policymakers will intervene to stop the currency's rise.