Human decisions to sell stocks may have been behind the August rout for equity markets after all, with hedge fund and mutual fund managers selling in response to turbulence and fears for China’s economy.

8月份全球股市下跌可能還是人為做出的拋售決定所致。面對(duì)市場(chǎng)動(dòng)蕩和圍繞中國經(jīng)濟(jì)的擔(dān)憂，對(duì)沖基金和共同基金經(jīng)理紛紛拋出股票。

The conclusion, based on work by strategists at JPMorgan, is a riposte to those who have attempted to blame esoteric trading strategies such as “risk parity for the correction’s size and speed.

這個(gè)結(jié)論是根據(jù)摩根大通(JPMorgan)策略師的研究得出的，它是對(duì)另一派觀點(diǎn)的還擊，后者企圖將股市調(diào)整的規(guī)模和速度歸咎于深?yuàn)W難懂的交易策略，如“風(fēng)險(xiǎn)平價(jià)。

“Discretionary managers were likely the ones responsible for the recent equity market sell-off, Nikolaos Panigirtzoglou, global asset allocation strategist for the bank, told clients.

“全權(quán)委托經(jīng)理人很可能要對(duì)近期股市拋售負(fù)責(zé)，摩根大通全球資產(chǎn)配置策略師尼可拉斯堠尼吉左格魯(Nikolaos Panigirtzoglou)告訴客戶。

Macro hedge funds and balanced mutual funds, both of which can invest in a variety of asset classes, took abrupt steps to reduce the risk of stock losses during the month. The aggregate equity beta of portfolios, a measure of the relationship between equity index movements and those for individual investment funds, declined sharply in August.

宏觀對(duì)沖基金和平衡型共同基金(兩者均可投資于各種資產(chǎn)類別)在8月期間采取緊急行動(dòng)降低股票虧損風(fēng)險(xiǎn)。各投資組合的整體股票貝塔系數(shù)(衡量股指變動(dòng)與個(gè)別投資基金變動(dòng)之間的關(guān)系)在8月份急劇下降。

The bank also found betas for so-called long-short hedge funds declined sharply in August as managers reacted to volatility by paring bets. JPMorgan’s work is based on a regression analysis of index movements, such as the HFRX, a hedge fund benchmark, as a proxy for fund holdings.

摩根大通還發(fā)現(xiàn)，所謂的多空對(duì)沖基金的貝塔系數(shù)也在8月份大幅下降，原因是經(jīng)理人紛紛通過平倉對(duì)波動(dòng)性作出反應(yīng)。該行的研究是基于對(duì)指數(shù)變動(dòng)(如對(duì)沖基金基準(zhǔn)指數(shù)HFRX)的回歸分析，將指數(shù)作為基金持股的代表。

The beta for risk parity funds, by comparison, declined only a small amount. Such funds have attracted attention owing to attempts to blend stocks, bonds and commodities, with selective use of leverage to produce returns similar to traditional investment products, while taking less risk.

相比之下，風(fēng)險(xiǎn)平價(jià)基金的貝塔系數(shù)僅小幅下降。近年此類基金受到關(guān)注，因?yàn)樗鼈冊(cè)噲D混合持有股票、債券和大宗商品，然后選擇性地使用杠桿，在降低風(fēng)險(xiǎn)的同時(shí)帶來與傳統(tǒng)投資產(chǎn)品相仿的回報(bào)。

Leon Cooperman, the founder of Omega Advisors, last week blamed “systemic/technical investors for the August sell-off. The veteran investor pointed to influential risk parity strategies pioneered by hedge funds such as Bridgewater, as well as so-called CTAs, funds specialising in trading derivatives based on computer models.

歐米茄顧問公司(Omega Advisors)創(chuàng)始人利昂錠珀曼 (Leon Cooperman)上周將8月的拋售歸咎于“系統(tǒng)性/技術(shù)型投資者。這位經(jīng)驗(yàn)豐富的投資者把矛頭指向一些有影響力的風(fēng)險(xiǎn)平價(jià)策略，這些策略是由布里奇沃特(Bridgewater)等對(duì)沖基金以及所謂CTA基金(專門從事基于計(jì)算機(jī)模型的衍生品交易的基金)開創(chuàng)的。

However, leverage used by risk parity funds tends to be concentrated in bonds, as prices for the securities have historically been less volatile than those for stocks. Performance for such funds has been poor this year, but there was no pronounced rise in bond volatility or the correlation between stocks and bonds in August.

然而，風(fēng)險(xiǎn)平價(jià)基金所用的杠桿往往集中于債券，因?yàn)榇祟愖C券價(jià)格的波動(dòng)性傳統(tǒng)上比股票低一些。今年以來此類基金表現(xiàn)一直不佳，但8月份債券波動(dòng)性(或者股票與債券之間的關(guān)聯(lián)度)并未顯著上升。

JPMorgan also found that CTA strategies posted a small gain in the third week of August, when the sell-off occurred. Such performance suggests they were positioned ahead of the decline, so trades were unlikely to amplify market moves.

摩根大通還發(fā)現(xiàn)，CTA策略在8月第三周(拋售發(fā)生時(shí))帶來了小幅增值。這樣的表現(xiàn)似乎說明，它們?cè)诠墒邢碌熬妥龊昧瞬季郑虼讼嚓P(guān)交易不太可能放大市場(chǎng)波動(dòng)。

Equity betas for balanced mutual funds are close to historical lows, but those for hedge funds still have room to fall further, Mr Panigirtzoglou said.

摩根大通的潘尼吉左格魯表示，平衡型共同基金的股票貝塔系數(shù)接近歷史低點(diǎn)，但對(duì)沖基金的貝塔系數(shù)仍有進(jìn)一步下滑空間。

There is also the question whether the correction reflects a reassessment of the outlook for the economic cycle and stock prices.

還有一個(gè)問題是，股市調(diào)整是否反映了市場(chǎng)對(duì)經(jīng)濟(jì)周期和股價(jià)前景作出重新評(píng)估?

“Cyclical risk became market risk in August, said Andrew Lapthorne, strategist for Société Générale. He said that attention was now focused on the extent to which any turn in the economic cycle starts to affect the availability of credit.

“周期性風(fēng)險(xiǎn)成了8月的市場(chǎng)風(fēng)險(xiǎn)，法國興業(yè)銀行(Société Générale)策略師安德魯拉普索恩(Andrew Lapthorne)表示。他表示，現(xiàn)在各方關(guān)注的是，經(jīng)濟(jì)周期的改變?cè)谑裁闯潭壬祥_始影響信貸的可獲得性。

Human decisions to sell stocks may have been behind the August rout for equity markets after all, with hedge fund and mutual fund managers selling in response to turbulence and fears for China’s economy.

8月份全球股市下跌可能還是人為做出的拋售決定所致。面對(duì)市場(chǎng)動(dòng)蕩和圍繞中國經(jīng)濟(jì)的擔(dān)憂，對(duì)沖基金和共同基金經(jīng)理紛紛拋出股票。

The conclusion, based on work by strategists at JPMorgan, is a riposte to those who have attempted to blame esoteric trading strategies such as “risk parity for the correction’s size and speed.

這個(gè)結(jié)論是根據(jù)摩根大通(JPMorgan)策略師的研究得出的，它是對(duì)另一派觀點(diǎn)的還擊，后者企圖將股市調(diào)整的規(guī)模和速度歸咎于深?yuàn)W難懂的交易策略，如“風(fēng)險(xiǎn)平價(jià)。

“Discretionary managers were likely the ones responsible for the recent equity market sell-off, Nikolaos Panigirtzoglou, global asset allocation strategist for the bank, told clients.

“全權(quán)委托經(jīng)理人很可能要對(duì)近期股市拋售負(fù)責(zé)，摩根大通全球資產(chǎn)配置策略師尼可拉斯堠尼吉左格魯(Nikolaos Panigirtzoglou)告訴客戶。

Macro hedge funds and balanced mutual funds, both of which can invest in a variety of asset classes, took abrupt steps to reduce the risk of stock losses during the month. The aggregate equity beta of portfolios, a measure of the relationship between equity index movements and those for individual investment funds, declined sharply in August.

宏觀對(duì)沖基金和平衡型共同基金(兩者均可投資于各種資產(chǎn)類別)在8月期間采取緊急行動(dòng)降低股票虧損風(fēng)險(xiǎn)。各投資組合的整體股票貝塔系數(shù)(衡量股指變動(dòng)與個(gè)別投資基金變動(dòng)之間的關(guān)系)在8月份急劇下降。

The bank also found betas for so-called long-short hedge funds declined sharply in August as managers reacted to volatility by paring bets. JPMorgan’s work is based on a regression analysis of index movements, such as the HFRX, a hedge fund benchmark, as a proxy for fund holdings.

摩根大通還發(fā)現(xiàn)，所謂的多空對(duì)沖基金的貝塔系數(shù)也在8月份大幅下降，原因是經(jīng)理人紛紛通過平倉對(duì)波動(dòng)性作出反應(yīng)。該行的研究是基于對(duì)指數(shù)變動(dòng)(如對(duì)沖基金基準(zhǔn)指數(shù)HFRX)的回歸分析，將指數(shù)作為基金持股的代表。

The beta for risk parity funds, by comparison, declined only a small amount. Such funds have attracted attention owing to attempts to blend stocks, bonds and commodities, with selective use of leverage to produce returns similar to traditional investment products, while taking less risk.

相比之下，風(fēng)險(xiǎn)平價(jià)基金的貝塔系數(shù)僅小幅下降。近年此類基金受到關(guān)注，因?yàn)樗鼈冊(cè)噲D混合持有股票、債券和大宗商品，然后選擇性地使用杠桿，在降低風(fēng)險(xiǎn)的同時(shí)帶來與傳統(tǒng)投資產(chǎn)品相仿的回報(bào)。

Leon Cooperman, the founder of Omega Advisors, last week blamed “systemic/technical investors for the August sell-off. The veteran investor pointed to influential risk parity strategies pioneered by hedge funds such as Bridgewater, as well as so-called CTAs, funds specialising in trading derivatives based on computer models.

歐米茄顧問公司(Omega Advisors)創(chuàng)始人利昂錠珀曼 (Leon Cooperman)上周將8月的拋售歸咎于“系統(tǒng)性/技術(shù)型投資者。這位經(jīng)驗(yàn)豐富的投資者把矛頭指向一些有影響力的風(fēng)險(xiǎn)平價(jià)策略，這些策略是由布里奇沃特(Bridgewater)等對(duì)沖基金以及所謂CTA基金(專門從事基于計(jì)算機(jī)模型的衍生品交易的基金)開創(chuàng)的。

However, leverage used by risk parity funds tends to be concentrated in bonds, as prices for the securities have historically been less volatile than those for stocks. Performance for such funds has been poor this year, but there was no pronounced rise in bond volatility or the correlation between stocks and bonds in August.

然而，風(fēng)險(xiǎn)平價(jià)基金所用的杠桿往往集中于債券，因?yàn)榇祟愖C券價(jià)格的波動(dòng)性傳統(tǒng)上比股票低一些。今年以來此類基金表現(xiàn)一直不佳，但8月份債券波動(dòng)性(或者股票與債券之間的關(guān)聯(lián)度)并未顯著上升。

JPMorgan also found that CTA strategies posted a small gain in the third week of August, when the sell-off occurred. Such performance suggests they were positioned ahead of the decline, so trades were unlikely to amplify market moves.

摩根大通還發(fā)現(xiàn)，CTA策略在8月第三周(拋售發(fā)生時(shí))帶來了小幅增值。這樣的表現(xiàn)似乎說明，它們?cè)诠墒邢碌熬妥龊昧瞬季郑虼讼嚓P(guān)交易不太可能放大市場(chǎng)波動(dòng)。

Equity betas for balanced mutual funds are close to historical lows, but those for hedge funds still have room to fall further, Mr Panigirtzoglou said.

摩根大通的潘尼吉左格魯表示，平衡型共同基金的股票貝塔系數(shù)接近歷史低點(diǎn)，但對(duì)沖基金的貝塔系數(shù)仍有進(jìn)一步下滑空間。

There is also the question whether the correction reflects a reassessment of the outlook for the economic cycle and stock prices.

還有一個(gè)問題是，股市調(diào)整是否反映了市場(chǎng)對(duì)經(jīng)濟(jì)周期和股價(jià)前景作出重新評(píng)估?

“Cyclical risk became market risk in August, said Andrew Lapthorne, strategist for Société Générale. He said that attention was now focused on the extent to which any turn in the economic cycle starts to affect the availability of credit.

“周期性風(fēng)險(xiǎn)成了8月的市場(chǎng)風(fēng)險(xiǎn)，法國興業(yè)銀行(Société Générale)策略師安德魯拉普索恩(Andrew Lapthorne)表示。他表示，現(xiàn)在各方關(guān)注的是，經(jīng)濟(jì)周期的改變?cè)谑裁闯潭壬祥_始影響信貸的可獲得性。